Package cleanup: React and Underscore

[jadbox]

It seems these libraries are not needed and would significantly reduce the size of the UMD builds I believe. React/react-dom looks largely unneeded, and since Underscore is only used for its events, it can be replaced with eventemitter3.

Also, babelify can be a dev-dependency instead of a top level package dep. Underscore can be replaced with the faster lodash4.

"dependencies": {
    "babelify": "^7.2.0",
...
    "backbone": "^1.2.3",
...
    "react": "^0.14.3",
    "react-dom": "^0.14.3",
    "underscore": "^1.8.3"
  }

[go-oleg]

@jadbox, thx for pointing these out.

• babelify: moving to devDependencies in package.json: move babelify into devDependencies #57
• eventemitter3: yes, this is something that makes sense to do
• lodash: yes, this is something that makes sense to do
• react: The Less view which is implemented here uses react. The fact that we package this specific set of views is largely a relic of the Jut 1.0 product. Whereas we probably will continue pushing all of these into juttle-engine/juttle-client-library, we can create a separate UMD build for each view so that you would only pull in the ones you want (e.g. the timechart UMD won't have react bundled in it). How does that sound?