Merge pull request #11 from devonzuegel/master

Implemented watchlist_candidates functionality for node wrapper
bump version to 3.1.0
implemented .create(), .retrieve(), & .list() for companies & tests for .list(); working on tests for .create() & .retrieve()
fixed mistake in tests for companies.list()
fixed silly mistake in main.js
added tests for companies.create() & companies.list()
added tests for companies.create() & companies.list()