WIP migration of the forms code to Bootstrap 3

This PR includes the progress I've made in migrating the forms from BS 2.0 to BS 3.0. **It is not complete**, but I've decided to open the PR in case someone wants to help and/or @florianeckerstorfer wants to merge it in.

When doing this, I also started to update the [http://bootstrap.braincrafted.com repository](https://github.com/braincrafted/bootstrap.braincrafted.com), and used that and the official Bootstrap 3.0 website as a roadmap of which forms code I should migrate first.

You can see here the progress that's been done with the forms:

http://egrajeda.github.io/bootstrap.braincrafted.com/components/forms.html