Migrate to Browserify / Gulp for Build Process

#### Scope
This PR changes quite a few things and so I want to start the discussion on this early in the process. Essentially I am proposing a move to using pure CommonJS for `localForage` source and then building it for release using browserify and a re-tooled build process using gulp. So far, this is now passing all tests (including tests for requirejs and component). In addition, I can verify installation via NPM and subsequent "browserification" in user-land is working as expected. This approach also cuts about 15 `KB` off the unminified build size (minified is holding steady at 19 `KB`).

#### Browserify Testing
Browserify fixes can be verified via:
```bash
npm install thisandagain/localForage#browserify
```

#### Impacts
Resolves GH-198 
Resolves GH-174
Closes GH-157

#### Yay!
![](http://media.giphy.com/media/oBdhYGbTTYglW/giphy.gif)
Oh my, I feel like this shouldn't be disabled in the JSHint rules. I'd rather explicitly define which variables we'll be referencing in either each offending file (and why) or in the globals object inside this `jshintrc`.