Migrate from bootstrap2 to boostrap3 (Major class changes)

This commit also includes adding bower, which means now running the
project requires a `bower install` too. This means that the bootstrap
and jQuery assets don't have to be kept in the repo.
Put talkurl href inside a string
Remove outdated custom CSS
Merge pull request #39 from CTPUG/feature/bootstrap-3

Migrate from bootstrap2 to boostrap3