Testing / Linting + Travis

[NoiSek]

Partially satisfies #12

• Adds coverage and corresponding badge
• Webpack now polyfills Promise automatically (We cannot do this with fetch because reasons)
• Adds npm run test, npm run lint, npm run py-test, npm run js-test commands
• Linting and initial tests integrated into Travis, Mocha by default runs any folder named 'tests' located within a static-source folder.

Migration notes:

• Run npm install -g eslint eslint-plugin-babel-register inferno mocha
• Run pip install -r requirements-dev.txt
• Devs should now run npm run test prior to pushing in order to satisfy Travis.

Pytest

Runs python tests from any file that matches test_*.py in the root tests folder.

Currently only capable of handling placeholders at the moment. Integrating tests into the Python half of our codebase is somewhat difficult given the need for appengine. Will solve in a future PR make a ticket for someone else to deal with.

Mocha

Example from saylua/static-source/lib/tests/test_BaseModel.js

import * as assert from "assert";
import Component from "inferno-component";

import BaseModel from "../Models/BaseModel.js";

describe('Models', function() {
  describe('BaseModel', function() {
    it('should initialize without error', (done) => {
      let model = new BaseModel();
      assert.ok(model);
      done();
    });
  });
});

Output:

Mediocre amount of additional info here.

[coveralls]

Changes Unknown when pulling d58e4e43e88556bedd200d8b9d4327efa9a548f2 on mocha into on master.