Tweak the tag editor widget to to propagate click events

Fixes #555
Tagging: CSS: fix tag/input field height diff
Display page: move tags into annotation card
Move tags into annotation card in user- and tagstream

Also remove now superflous .gray-tags class from CSS.
Fixes #526.
d-t-mapper updated to 1638f15d5 (chrome workarounds)
Added hints and function stubs for control bar.

Fixes #560.
Merge branch 'develop' of https://github.com/hypothesis/h into 455-testing