Remove unused code from environment.js

We can't get anything from window in config/environment.js, because it's run at
compile time, not at run time.

config/environment.js

@@ -1,28 +1,5 @@
 /* jshint node: true */
 
-// TODO: how to include this from app/utils/ here?
-var extend = function(out) {
-  out = out || {};
-
-  for (var i = 1; i < arguments.length; i++) {
-    var obj = arguments[i];
-
-    if (!obj)
-      continue;
-
-    for (var key in obj) {
-      if (obj.hasOwnProperty(key)) {
-        if (typeof obj[key] === 'object')
-          deepExtend(out[key], obj[key]);
-        else
-          out[key] = obj[key];
-      }
-    }
-  }
-
-  return out;
-};
-
 module.exports = function(environment) {
   var ENV = {
     modulePrefix: 'travis',
@@ -54,11 +31,6 @@ module.exports = function(environment) {
     intervals: { updateTimes: 1000 }
   };
 
-  // merge environment vars from index.html
-  if(typeof TravisENV !== 'undefined') {
-    extend(ENV, TravisENV);
-  }
-
   if (environment === 'development') {
     // ENV.APP.LOG_RESOLVER = true;
     // ENV.APP.LOG_ACTIVE_GENERATION = true;