Update gemspec for turbolinks 1.1.1

Please triple check if I messed up something, I'm still new in ruby.

Test passes, client side validations works in my turbolinks powered applications in both development and production environments.

Hope it helps

GT

CHANGELOG
```
Regenerated the JavaScript file
Changed the deprecated `require 'mocha'` to `require 'mocha/setup'`
Version bump to 1.1.1
```