Reduce raven.min.js filesize (#721)

* Inline src/utils.js into src/raven.js for better compression
* Alias stuff to save bytes

Author: benvinegar

Gruntfile.js

@@ -196,7 +196,7 @@ module.exports = function(grunt) {
                     unused: true,
 
                     global_defs: {
-                        'TEST': false
+                        '__DEV__': false
                     }
                 }
             },