Add Cocoapods and French support

Hi,

I added the french and the Cocoapods support. 

To fully support Cocoapods you will need to :
* update the "s.source" value in the "LTHPasscodeViewController.podspec" file  with your github repo
* update the "s.version" value in the "LTHPasscodeViewController.podspec" file with the tag you want to create. Right now, the podspec is link to a new created tag, "3.0.0". It exists only in my Github repository.
* follow http://guides.cocoapods.org/making/specs-and-specs-repo.html#if-you-do-not-have-push-access-to-cocoapodsspecs to add this pod to the Cocoapods repo.

Regards,

Nicolas Guillot