chore(dependencies): Remove unused babel dependencies.

Author: trevorgerhardt

package.json

@@ -32,16 +32,13 @@
   "homepage": "https://github.com/conveyal/mastarm",
   "dependencies": {
     "aws-sdk": "^2.4.2",
-    "babel-cli": "^6.10.1",
     "babel-core": "^6.10.4",
     "babel-jest": "^15.0.0",
     "babel-plugin-add-module-exports": "^0.2.1",
     "babel-plugin-transform-runtime": "^6.9.0",
-    "babel-polyfill": "^6.13.0",
     "babel-preset-es2015": "^6.9.0",
     "babel-preset-react": "^6.5.0",
     "babel-preset-stage-0": "^6.5.0",
-    "babel-runtime": "^6.9.2",
     "babelify": "^7.3.0",
     "browserify": "^13.0.1",
     "browserify-markdown": "1.0.0",