Enable/Unprefix Animations & Transitions, add basic tests

sky/tools/third_party/PrettyPatch/PrettyPatch.rb

 require 'cgi'
 require 'diff'
 require 'open3'
 require 'open-uri'
 require 'pp'
 require 'set'
 require 'tempfile'
 
 module PrettyPatch
 
@@ skipping 306 matching lines @@
   max-width: 100%;
   min-width: 200px;
 }
 
 .comment textarea, .overallComments textarea {
   display: block;
   width: 100%;
 }
 
 .overallComments .open {
-  -webkit-transition: height .2s;
+  transition: height .2s;
   height: 4em;
 }
 
 #statusBubbleContainer.wrap {
   display: block;
 }
 
 #toolbar {
   display: -webkit-flex;
   display: -moz-flex;
@@ skipping 62 matching lines @@
 }
 
 .ExpandText {
   margin-left: 0.67em;
 }
 
 .LinkContainer {
   font-family: sans-serif;
   font-size: small;
   font-style: normal;
-  -webkit-transition: opacity 0.5s;
+  transition: opacity 0.5s;
 }
 
 .LinkContainer a {
   border: 0;
 }
 
 .LinkContainer label:after,
 .LinkContainer a:after {
   content: " | ";
   color: black;
@@ skipping 59 matching lines @@
   display: none;
 }
 
 .autosave-state {
   position: absolute;
   right: 0;
   top: -1.3em;
   padding: 0 3px;
   outline: 1px solid #DDD;
   color: #8FDF5F;
-  font-size: small;   
+  font-size: small;
   background-color: #EEE;
 }
 
 .autosave-state:empty {
   outline: 0px;
 }
 .autosave-state.saving {
   color: #E98080;
 }
 
@@ skipping 495 matching lines @@
     class ContextLine < Line
         def initialize(context)
             super("@", "@", context)
         end
 
         def classes
             super << "context"
         end
     end
 end