bootstrap-daterangepicker with sugar.js instead of Date.js

Not sure if this is the right sort of thing to be merged into master but its worth checking out since there may be some users who don't want to use the old Date.js library. The additional version of the daterangepicker added in my fork uses the [sugar.js Date library](http://sugarjs.com/dates) instead. 

I've found Date.js to be pretty buggy, especially when dealing with times. For instance: `Date.parse("1/1/2012 12:00 PM")` results in `null` when using the version of Date.js linked on the official website. It hasn't been supported in ages. On the other hand, the sugar.js Date library is modern and overall awesome. The syntax is farily similar to Date.js as it extends the date object.

Anyway, hopefully this can be helpful in someway. Thanks

Note: In this version localization defaults for day and month names are set to english