Add unit testing to React and Javascript code

[therealsamf]

We'll need to use utilize several tools to properly unit test our code

Mocha : Test runner. Utilizes Node.js

Enzyme : Testing framework for React components. React components can be a nuisance with just Mocha alone, but this framework makes it easy

SinonJS : Provides mocks and stubs, so we can test at the smallest level without depending on outside code

Chai : Assertion library for mocha. Plays well with sinon, enzyme, and mocha