Loosen references to 2.0.0 and 2.1.0 to just specify 2.0 or 2.1

Bump docs repo ruby to 2.1.5 from 2.1.2

Author: tjgrathwell

.travis.yml

@@ -1,4 +1,4 @@
 language: ruby
 rvm:
-  - 2.1.2
+  - 2.1.5
 cache: bundler

Gemfile

@@ -1,6 +1,6 @@
 source "https://rubygems.org"
 
-ruby '2.1.2'
+ruby '2.1.5'
 
 gem 'activesupport'
 gem "erector", "~> 0.10.0"

Gemfile.lock

@@ -7,7 +7,7 @@ GEM
       minitest (~> 5.1)
       thread_safe (~> 0.1)
       tzinfo (~> 1.1)
-    bootstrap-sass (3.3.0.1)
+    bootstrap-sass (3.3.1.0)
       sass (~> 3.2)
     celluloid (0.16.0)
       timers (~> 4.0.0)
@@ -37,12 +37,12 @@ GEM
     jquery-cdn (2.1.1)
       sprockets (>= 2)
     json (1.8.1)
-    listen (2.7.11)
+    listen (2.8.0)
       celluloid (>= 0.15.2)
       rb-fsevent (>= 0.9.3)
       rb-inotify (>= 0.9)
     mini_portile (0.6.1)
-    minitest (5.4.2)
+    minitest (5.4.3)
     multi_json (1.10.1)
     nokogiri (1.6.4.1)
       mini_portile (~> 0.6.0)
@@ -80,7 +80,7 @@ GEM
       sexp_processor (~> 4.0)
     ruby_parser (3.6.3)
       sexp_processor (~> 4.1)
-    sass (3.4.7)
+    sass (3.4.8)
     sexp_processor (4.4.4)
     sinatra (1.4.5)
       rack (~> 1.4)

sites/en/installfest/get_a_sticker.step

@@ -16,7 +16,7 @@ step "Have a volunteer check your tool versions" do
     console "ruby -v"
     fuzzy_result "ruby {FUZZY}1.9.3p125 (2012-02-16 revision 34643) [x86_64-darwin11.3.0]{/FUZZY}"
 
-    tip "Depending on your environment, your Ruby version might be **1.9.3**, **2.0.0** or **2.1.0**. As long as it's 1.9.3 or above, you're good to go."
+    tip "Depending on your environment, your Ruby version might be **1.9.3**, **2.0** or **2.1**. As long as it's 1.9.3 or above, you're good to go."
 
     console "bundle -v"
     fuzzy_result "Bundler version 1{FUZZY}.x.x{/FUZZY}"

sites/en/intro-to-rails/intro-to-rails.step

@@ -38,7 +38,7 @@ day... unless I really screwed something up. :D
 
 We're going to be working with:
 
-* ruby 1.9.3, 2.0.0 or 2.1.0 installed via RVM (Mac or Linux) or RailsInstaller (Mac or Windows)
+* ruby 1.9.3, 2.0 or 2.1 installed via RVM (Mac or Linux) or RailsInstaller (Mac or Windows)
 * rails 4.1.x
 * bundler
 * sqlite