update latest browser targets
derequire after browserify closes #274

Can't add derequire in grunt-browserify since it expects stream and
passes in options in a form derequire does not like. Use command line
task as workaround.
add derequire to build
chrome 39 not ready on mac
Merge branch 'develop'
Bind meta+K to toggle the link tooltip popup
Merge branch 'link-hotkey'

Conflicts:
	src/modules/link-tooltip.coffee