copy improvements on data export
add + to keyboard help key simul combos
remove a bunch of needless css prefixes
who the hell puts a } in front of a SASS line?
add back in a few -webkit- css3 prefixes

due to http://shouldiprefix.com/ and iOS mainly!
add back in @-webkit-keyframes
clean up CSS3 animations a bit
FEATURE: default emoji override
FIX: 1.9 regression on i18n strings with variables
FIX: proper redirection when deleting a user
Merge remote-tracking branch 'source/master'