v0.1.16

The next release!

- mergeOptions is now attached to Marionette, and not classes
- Reorganizes the source code
- Loading indicator when compiling a Gistbook appears instantly now
- Refactors to the code to take advantage of more ES6 features
- New Route events: `unauthorized`, `redirect`, `fetch`, and `show`
- New Router events: `unauthorized`, `redirect`
- `StateRouter` auth code was generalized; Radio dependency removed