allowing quoted strings within object assignment, a in JS and JSON

lib/coffee_script/grammar.y

@@ -121,6 +121,7 @@ rule
   # Assignment within an object literal.
   AssignObj:
     IDENTIFIER ":" Expression         { result = AssignNode.new(val[0], val[2], :object) }
+  | STRING ":" Expression             { result = AssignNode.new(val[0], val[2], :object) }
   | Comment                           { result = val[0] }
   ;
 

test/fixtures/execution/test_everything.cs

@@ -6,7 +6,7 @@ func: =>
     a--.
 
   c: {
-    text: b
+    "text": b
   }
 
   c: 'error' unless 42 > 41

test/fixtures/execution/test_everything.js

@@ -7,7 +7,7 @@
       a--;
     }
     var c = {
-      text: b
+      "text": b
     };
     if (!(42 > 41)) {
       c = 'error';