bootstrap3: make the search input smaller

This makes the navbar fits into 1024 pixels and will help with #144
bootstrap3: use default style for navbar

More readable (imho :), possibly we are gonna revisit this us using bootswatch
or custom building bootstrap.

Fix #150
bootstrap3: fixup navbar-right links

Override negative right margin that makes History and View on site
links look crappy.

Fix #143
test project: add get_absolute_url method to a model

So we can test that too.
Update CHANGELOG