Remove unused dependencies.

package.json

@@ -50,7 +50,6 @@
     "julien-f-unzip": "^0.2.1",
     "lodash.assign": "^3.0.0",
     "lodash.bind": "^3.0.0",
-    "lodash.clone": "^3.0.1",
     "lodash.difference": "^3.2.0",
     "lodash.endswith": "^3.0.2",
     "lodash.filter": "^3.1.0",
@@ -66,9 +65,7 @@
     "lodash.isstring": "^3.0.0",
     "lodash.keys": "^3.0.4",
     "lodash.map": "^3.0.0",
-    "lodash.omit": "^3.1.0",
     "lodash.pick": "^3.0.0",
-    "lodash.pluck": "^3.0.2",
     "lodash.result": "^3.0.0",
     "lodash.startswith": "^3.0.1",
     "make-error": "^1",