site: remove jQuery from assets

`git grep assets/jq` didn't yield any results except for the front page

As single commit to allow for emergency reverts. :)
site: use bower, update components

- updated Twitter Bootstrap to 2.3.2 (required small popover change)
- updated jQuery to 1.10
- used bower for dep management
Merge pull request #679 from passy/hyper-bowerification

Use bower for the site