Updated: package.json dependencies -> devDependencies

(cherry picked from commit d838334)

Author: nervgh

package.json

@@ -8,7 +8,7 @@
         "url": "https://github.com/nervgh"
     },
     "main": "dist/angular-file-upload.min.js",
-    "dependencies": {
+    "devDependencies": {
         "gulp": "^3.9.0",
         "webpack": "^1.10.1",
         "webpack-stream": "^2.0.0"