Design tweaks mostly based on https://www.loomio.org/discussions/3097

. Lose pie shadow

Dashboard:

. Lose start new discussion button
. Gentler highlight colour
. Make highlight work on unread lines (with a wicked ! important)
. Groups panel typography & button to bottom
. Nudge live pie to line up with fake pie

Discussion page:

. Better vertical spacing in header
. User-contributed text to black
. Gentler chrome
. Context panel & right-context panel tweaks
. Discussion and proposal headers gentler
. Activity list tweaks, including softening lines, inline names, icons out-dented
. Lose double-quotes around proposals & discussion titles in activity list

update specs to reflect design, update new_vote to pass spec

stupid button doesn't exists even when click_on fixed

discussiuon fix

fix ajax target with add comment

Pie chart legend tweaks

fix markdown saving