Freedom: remove the majority of devDependencies, remove bundling, remove babel-runtime, simplify project

[AlbinoDrought]

I'm tired of the package updates and general clutter.

This PR trims the project down to what I feel is required for a base, working cachios:

• axios for requests
• node-cache for cache
• object-hash for creating cache keys
• coveralls for coverage
• jest for testing
• moxios for mocking axios
• express for testing against a "real" server

It removes:

• export, import, let, const
• eslint, but the project still adheres to eslint-config-airbnb
• babel-runtime - this could affect browser compatibility, but it "shouldn't". Axios already requires promises to be natively supported (it does not polyfill them) and that is the only "new JS" we use.

Because I'm unsure of what breaking changes this may have, I'm going to eventually release it as 2.0.0.

[coveralls]

Coverage remained the same at 100.0% when pulling 96bd6e1ba37633abae9901d239a6dc585d844c1a on feature/freedom into 092755b85bb80809434fd508490693b5cad404ca on master.