chore(ngdoc): fix version number parsing for doc version switcher
chore(changelog): fix link to 1.2.0rc1
docs(changelog): correct version number formats in changelog
chore(release): start 1.2.0-rc.3 ferocious-twitch iteration
chore(release): add script for comparing master and stable branches
docs(changelog): add a note about directives ending w/ -start and -end

Closes #3589
refactor($animate): use CSS3 transition/animation events instead of $timeouts to track ongoing animations

Closes #3629