Add example unit tests for controller, directive, filters, serivces, as well as an e2e protractor test. Move 'test' directory up one directory

If two chunks (with potentially overlapping modules) are intended to be
loaded on the same page we need to use CommonsChunkPlugin to extract the
common dependencies into a commons chunk to prevent some modules from
being loaded twice. Alternatively we could stop using multiple chunks.

Integrate eslint with webpack. Adds a couple seconds to initial build, but negligible time to incremental (watch) builds