[guide] remove/update outdated links.

Fixes airbnb#1626.

Author: ljharb

README.md

@@ -670,7 +670,7 @@ Other Style Guides
   - [7.3](#functions--in-blocks) Never declare a function in a non-function block (`if`, `while`, etc). Assign the function to a variable instead. Browsers will allow you to do it, but they all interpret it differently, which is bad news bears. eslint: [`no-loop-func`](http://eslint.org/docs/rules/no-loop-func.html)
 
   <a name="functions--note-on-blocks"></a><a name="7.4"></a>
-  - [7.4](#functions--note-on-blocks) **Note:** ECMA-262 defines a `block` as a list of statements. A function declaration is not a statement. [Read ECMA-262’s note on this issue](http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-262.pdf#page=97).
+  - [7.4](#functions--note-on-blocks) **Note:** ECMA-262 defines a `block` as a list of statements. A function declaration is not a statement.
 
     ```javascript
     // bad
@@ -3358,9 +3358,9 @@ Other Style Guides
 
 ## Resources
 
-**Learning ES6**
+**Learning ES6+**
 
-  - [Draft ECMA 2015 (ES6) Spec](https://people.mozilla.org/~jorendorff/es6-draft.html)
+  - [Latest ECMA spec](https://tc39.github.io/ecma262/)
   - [ExploringJS](http://exploringjs.com/)
   - [ES6 Compatibility Table](https://kangax.github.io/compat-table/es6/)
   - [Comprehensive Overview of ES6 Features](http://es6-features.org/)
@@ -3427,7 +3427,6 @@ Other Style Guides
   - [Perfection Kills](http://perfectionkills.com/)
   - [Ben Alman](http://benalman.com/)
   - [Dmitry Baranovskiy](http://dmitry.baranovskiy.com/)
-  - [Dustin Diaz](http://dustindiaz.com/)
   - [nettuts](http://code.tutsplus.com/?s=javascript)
 
 **Podcasts**
@@ -3442,7 +3441,7 @@ Other Style Guides
   This is a list of organizations that are using this style guide. Send us a pull request and we'll add you to the list.
 
   - **123erfasst**: [123erfasst/javascript](https://github.com/123erfasst/javascript)
-  - **3blades**: [3Blades/javascript](https://github.com/3blades/javascript)
+  - **3blades**: [3Blades](https://github.com/3blades)
   - **4Catalyzer**: [4Catalyzer/javascript](https://github.com/4Catalyzer/javascript)
   - **Aan Zee**: [AanZee/javascript](https://github.com/AanZee/javascript)
   - **Adult Swim**: [adult-swim/javascript](https://github.com/adult-swim/javascript)
@@ -3455,7 +3454,7 @@ Other Style Guides
   - **Axept**: [axept/javascript](https://github.com/axept/javascript)
   - **BashPros**: [BashPros/javascript](https://github.com/BashPros/javascript)
   - **Billabong**: [billabong/javascript](https://github.com/billabong/javascript)
-  - **Bisk**: [bisk/javascript](https://github.com/Bisk/javascript/)
+  - **Bisk**: [bisk](https://github.com/Bisk/)
   - **Bonhomme**: [bonhommeparis/javascript](https://github.com/bonhommeparis/javascript)
   - **Brainshark**: [brainshark/javascript](https://github.com/brainshark/javascript)
   - **CaseNine**: [CaseNine/javascript](https://github.com/CaseNine/javascript)
@@ -3472,23 +3471,23 @@ Other Style Guides
   - **ExactTarget**: [ExactTarget/javascript](https://github.com/ExactTarget/javascript)
   - **Expensify** [Expensify/Style-Guide](https://github.com/Expensify/Style-Guide/blob/master/javascript.md)
   - **Flexberry**: [Flexberry/javascript-style-guide](https://github.com/Flexberry/javascript-style-guide)
-  - **Gawker Media**: [gawkermedia/javascript](https://github.com/gawkermedia/javascript)
+  - **Gawker Media**: [gawkermedia](https://github.com/gawkermedia/)
   - **General Electric**: [GeneralElectric/javascript](https://github.com/GeneralElectric/javascript)
   - **Generation Tux**: [GenerationTux/javascript](https://github.com/generationtux/styleguide)
   - **GoodData**: [gooddata/gdc-js-style](https://github.com/gooddata/gdc-js-style)
   - **Grooveshark**: [grooveshark/javascript](https://github.com/grooveshark/javascript)
   - **Grupo-Abraxas**: [Grupo-Abraxas/javascript](https://github.com/Grupo-Abraxas/javascript)
   - **Honey**: [honeyscience/javascript](https://github.com/honeyscience/javascript)
   - **How About We**: [howaboutwe/javascript](https://github.com/howaboutwe/javascript-style-guide)
-  - **Huballin**: [huballin/javascript](https://github.com/huballin/javascript)
+  - **Huballin**: [huballin](https://github.com/huballin/)
   - **HubSpot**: [HubSpot/javascript](https://github.com/HubSpot/javascript)
   - **Hyper**: [hyperoslo/javascript-playbook](https://github.com/hyperoslo/javascript-playbook/blob/master/style.md)
   - **InterCity Group**: [intercitygroup/javascript-style-guide](https://github.com/intercitygroup/javascript-style-guide)
   - **Jam3**: [Jam3/Javascript-Code-Conventions](https://github.com/Jam3/Javascript-Code-Conventions)
   - **JeopardyBot**: [kesne/jeopardy-bot](https://github.com/kesne/jeopardy-bot/blob/master/STYLEGUIDE.md)
   - **JSSolutions**: [JSSolutions/javascript](https://github.com/JSSolutions/javascript)
   - **Kaplan Komputing**: [kaplankomputing/javascript](https://github.com/kaplankomputing/javascript)
-  - **KickorStick**: [kickorstick/javascript](https://github.com/kickorstick/javascript)
+  - **KickorStick**: [kickorstick](https://github.com/kickorstick/)
   - **Kinetica Solutions**: [kinetica/javascript](https://github.com/kinetica/Javascript-style-guide)
   - **LEINWAND**: [LEINWAND/javascript](https://github.com/LEINWAND/javascript)
   - **Lonely Planet**: [lonelyplanet/javascript](https://github.com/lonelyplanet/javascript)
@@ -3498,8 +3497,8 @@ Other Style Guides
   - **MitocGroup**: [MitocGroup/javascript](https://github.com/MitocGroup/javascript)
   - **ModCloth**: [modcloth/javascript](https://github.com/modcloth/javascript)
   - **Money Advice Service**: [moneyadviceservice/javascript](https://github.com/moneyadviceservice/javascript)
-  - **Muber**: [muber/javascript](https://github.com/muber/javascript)
-  - **National Geographic**: [natgeo/javascript](https://github.com/natgeo/javascript)
+  - **Muber**: [muber](https://github.com/muber/)
+  - **National Geographic**: [natgeo](https://github.com/natgeo/)
   - **Nimbl3**: [nimbl3/javascript](https://github.com/nimbl3/javascript)
   - **Nulogy**: [nulogy/javascript](https://github.com/nulogy/javascript)
   - **Orange Hill Development**: [orangehill/javascript](https://github.com/orangehill/javascript)
@@ -3509,13 +3508,13 @@ Other Style Guides
   - **Razorfish**: [razorfish/javascript-style-guide](https://github.com/razorfish/javascript-style-guide)
   - **reddit**: [reddit/styleguide/javascript](https://github.com/reddit/styleguide/tree/master/javascript)
   - **React**: [facebook.github.io/react/contributing/how-to-contribute.html#style-guide](https://facebook.github.io/react/contributing/how-to-contribute.html#style-guide)
-  - **REI**: [reidev/js-style-guide](https://github.com/rei/code-style-guides/blob/master/docs/javascript.md)
+  - **REI**: [reidev/js-style-guide](https://github.com/rei/code-style-guides/)
   - **Ripple**: [ripple/javascript-style-guide](https://github.com/ripple/javascript-style-guide)
   - **Sainsbury's Supermarkets**: [jsainsburyplc](https://github.com/jsainsburyplc)
   - **SeekingAlpha**: [seekingalpha/javascript-style-guide](https://github.com/seekingalpha/javascript-style-guide)
   - **Shutterfly**: [shutterfly/javascript](https://github.com/shutterfly/javascript)
   - **Sourcetoad**: [sourcetoad/javascript](https://github.com/sourcetoad/javascript)
-  - **Springload**: [springload/javascript](https://github.com/springload/javascript)
+  - **Springload**: [springload](https://github.com/springload/)
   - **StratoDem Analytics**: [stratodem/javascript](https://github.com/stratodem/javascript)
   - **SteelKiwi Development**: [steelkiwi/javascript](https://github.com/steelkiwi/javascript)
   - **StudentSphere**: [studentsphere/javascript](https://github.com/studentsphere/guide-javascript)