Remove changelog; pin to lefnire's version of icalendar

package.json

@@ -32,7 +32,7 @@
     "grunt-nodemon": "~0.3.0",
     "grunt-spritesmith": "~3.5.0",
     "gulp": "^3.9.0",
-    "icalendar": "^0.7.1",
+    "icalendar": "lefnire/node-icalendar#e06da0e55901f0ba940dfadc42c158ed0b1fead9",
     "image-size": "~0.3.2",
     "in-app-purchase": "^0.2.0",
     "jade": "~1.7.0",
@@ -91,7 +91,6 @@
     "deep-diff": "~0.1.4",
     "event-stream": "^3.2.2",
     "expect.js": "~0.2.0",
-    "git-changelog": "^0.1.8",
     "glob": "^4.3.5",
     "grunt-contrib-imagemin": "^0.9.4",
     "istanbul": "^0.3.14",