Kickout 3.2.0a (That's personal customized)
Include TwitterBootstrap 3.3.0

And Update html5.js to html5shiv.min.js, jquery-1.11.1
Implement customized bootstrap.

- Loading `lib/sinatra/assets/VERSION_NAME/config.yaml`
- VERSION_NAME prefix `customized_` as ignore from git.
  e.g.) `lib/sinatra/assets/cusomized_3.2.0/*`
Tweak
Implement to Dynamic version change