Add initial styles for daterange markup
Don't import ; update less buildfile and css file
Don't import `.input-append .add-on`; update less buildfile and css file
Implement initial daterange picker
Merge latest master changes into range branch

--HG--
rename : build.less => build/build.less
Merge latest master into range branch
Merge latest master changes into range branch
Fix range class names reversion
Update functions used to update picker values
Fix off-by-one error
Merge latest master into range branch
Add remove option for range picker
Add inputs option, for explicitly-created rangepickers
Style in-range today cells nicely
Merge range branch into master