Update sass-loader. It was giving compile errors.

package.json

@@ -75,7 +75,7 @@
     "serve-favicon": "^2.2.0",
     "serve-static": "^1.9.2",
     "slack-client": "^2.0.0-beta.3",
-    "socket.io": "1.4.5",
+    "socket.io": "1.4.8",
     "split": "^1.0.0",
     "stf-appstore-db": "^1.0.0",
     "stf-browser-db": "^1.0.2",
@@ -100,7 +100,7 @@
     "event-stream": "^3.3.2",
     "exports-loader": "^0.6.2",
     "extract-text-webpack-plugin": "^1.0.1",
-    "file-loader": "^0.8.5",
+    "file-loader": "^0.9.0",
     "gulp": "^3.8.11",
     "gulp-angular-gettext": "^2.1.0",
     "gulp-eslint": "^1.1.1",
@@ -133,11 +133,11 @@
     "protractor": "^3.0.0",
     "protractor-html-screenshot-reporter": "0.0.21",
     "raw-loader": "^0.5.1",
-    "sass-loader": "^3.1.2",
-    "script-loader": "^0.6.1",
+    "sass-loader": "^4.0.0",
+    "script-loader": "^0.7.0",
     "sinon": "^1.17.2",
     "sinon-chai": "^2.7.0",
-    "socket.io-client": "1.4.5",
+    "socket.io-client": "1.4.8",
     "style-loader": "^0.13.0",
     "template-html-loader": "^0.0.3",
     "url-loader": "^0.5.7",