Change Sublime references to Atom in Ruby curriculum

Author: camillevilla

sites/en/learn-to-code/learn-to-code.md

@@ -70,8 +70,7 @@ Follow along at http://docs.railsbridge.org/learn-to-code
   * Ruby version 2.3 preferred, but 1.9+ is fine too
     * run `ruby -v` to check
 * a text editor
-  * e.g. Sublime Text 2
-  * http://www.sublimetext.com/2
+  * we recommend [Atom](https://atom.io/), but you can try a [different editor](/installfest/editors)
 
 * If you do not have both of these things, RAISE YOUR HAND
   * visit http://installfest.railsbridge.org for more instructions

sites/en/learn-to-code/the_command_line.md

@@ -76,8 +76,8 @@
 * a text editor is a program that edits a text file
 * a text editor is *like* a word processor
 * but a text editor is **not** a word processor
-* You probably have *Sublime Text* 
-  * others include *TextMate*, *Notepad++*
+* You probably have *Atom* 
+  * or [another text editor](/installfest/editors)
   * but **NOT** *TextEdit* or *Notepad* or *Microsoft Word*
 
 # Source File

sites/en/ruby/running_programs_from_a_file.step

@@ -10,7 +10,7 @@ A text editor is a word processor that saves in plain text format.  This is
 unlike Word, which saves files in a special format that only Word can read.
 
 We may have recommended a particular text editor during the Installfest, such as
-SublimeText.  You can use any editor you like so long as it saves plain text.
+Atom.  You can use any editor you like so long as it saves plain text. 
 
 It'll helpful to keep your text editor running, since you'll be coming back to
 it often.