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
add support for NO CONFLICT and DATA-API
add test for DATA-API, data-provide="datepicker"
Update bootstrap-datepicker.js
Update datepicker.css
Update datepicker.less
Update component.js
Update events.js
Update 2011.js
Update 2012.js
Update options.js
Update 2011.js
Update 2012.js
Fix range class names reversion