In order to make the license that applies to each file as clear as possible, and to be consistent with elasticsearch, we are adding Apache 2.0 license headers to the top of each file.
Existence of this header is enforced by eslint and tslint and missing headers were automatically added in the last commit by running:
```
node scripts/eslint --fix && node scripts/tslint --fix
```
* [webpack] upgrade to @elastic/webpack-directory-name-as-main v2
* bump @elastic/webpack-directory-name-as-main
* import browser mocha with webpackShim
`import 'mocha'` will resolve to `mocha/index.js`, which points to
`mocha/lib/mocha.js`, the node version of mocha. This will not work in
the browser.
Since ng_mock is browser code, we need the mocha build for the browser,
which lives at `mocha/mocha.js`. This isn't referenced at all in the
package.json file, but is references in the bower.json file. Webpack,
however, doesn't observe the bower config, so we need to specifically
reach into the mocha package and point to the `mocha/mocha.js` file.
