COUCHDB-2340 - Remove extra subnav breadcrumb.

This removes the extra "_changes" breadcrumb in the databases subnav, as well as a few minor style tweaks to get the database name to line up all nice-like.

Tested for regression in:
Safari 7.0.6
Chrome 37.0.2062.124
Firefox 32.0.2
An iPhone running iOS 8 (Just because).