Add "Sticky Differential Headers" user script.
Prefix "Sticky Differential Headers" script name with "Phabricator".
Shrink "Simple Differential" metadata (right hand side).

 - Replaced "X Reviewers" with "[icon] X".
 - Moved status text into a tooltip over DXXXXX.
 - Increase max width of tooltips.
Merge branch 'master' of git://github.com/ypisetsky/phabricator-scripts into ypisetsky-master

Conflicts:
	src/simple-differential.user.js
Add support for `?complex` query parameter.
Display LOC as "[icon] X" instead of "Lines: X".
fix stale diffs status