Remove merge2 package since it is no longer used.

Author: mattmazzola

gulpfile.js

@@ -12,7 +12,6 @@ var ghPages = require('gulp-gh-pages'),
     fs = require('fs'),
     del = require('del'),
     moment = require('moment'),
-    merge = require('merge2'),
     karma = require('karma'),
     typedoc = require('gulp-typedoc'),
     webpack = require('webpack');

package.json

@@ -58,7 +58,6 @@
     "karma-jasmine": "^0.3.7",
     "karma-phantomjs-launcher": "^1.0.0",
     "karma-spec-reporter": "0.0.23",
-    "merge2": "^1.0.1",
     "moment": "^2.14.1",
     "phantomjs-prebuilt": "^2.1.3",
     "run-sequence": "^1.1.5",