Removed root .babelrc file, upgrades

- Upgraded packages
- Fixed sourcemaps
- Moved .babelrc config into client folder
- Created .babelrc in tests folder for client tests

.babelrc

@@ -1,14 +0,0 @@
-{
-  "sourceMaps": true,
-  "presets": [
-    "es2015"
-  ],
-  "plugins": [
-    "add-module-exports",
-    "transform-class-properties",
-    "transform-decorators-legacy",
-    "transform-object-assign",
-    "transform-object-rest-spread",
-    "transform-react-jsx"
-  ]
-}