Add self to requirements
Assume trusted X-Forwarded-* for dev server
add Procfile
Reduced space between annotation cards.

Reduced space between annotation cards by 1/2. This is solves [issue 493](https://github.com/hypothesis/h/issues/493) and looks much nicer.
Fixes #519 by partially reverting 13ad5fa4
String change: quote highlighted -> highlight
Merge pull request #518 from RawKStar77/develop

Reduced space between annotation cards.
Merge branch 'develop' of https://github.com/hypothesis/h into 455-testing
check to see elasticsearch is running before running tests