Persisting selected end time when switching to a later start date.

Keeps the users end time selected instead of defaulting to 12AM the
next day when a user chooses a later start date.
Apply 'active' class to daterangepicker button when it's open
Include chosen range label as 3rd parameter to callback function

Important/useful for if you want to remember the user chose something like 'yesterday' and have it
always show the dynamic 'yesterday' on future visits versus a specific date.
Access 'moment' like we do '$'

It's a step in the right direction for accessing 'moment'
so we can eventually avoid the console warning caused by
https://github.com/moment/moment/pull/1220
Code fixes/cleanup after running JSHint
Merge pull request #266 from elasticsales/callback-with-label

Include chosen range label as 3rd parameter to callback function
Merge pull request #265 from elasticsales/active-class

Apply 'active' class to daterangepicker button when it's open
Merge pull request #267 from elasticsales/global-moment

Simple code cleanup / JSHint fixes
Bump version number, namespace events
Merge pull request #249 from dfmcphee/master

Persisting selected end time when switching to a later start date.
Update README.md
Allow null to be passed as options, so you can specify a callback without options
Show callback parameters in console in examples.html
Make endDate represent the end of the chosen date/range, rather than the start of the last day
Use .show-calendar CSS class to control showing/hiding of calendars
Some misc code cleanup / simplifications
Redo how daterangepicker is open/closed, fixing a couple problems.

- Allows clicking the trigger button/element to hide the picker (like regular bootstrap dropdowns)
- When a Bootstrap dropdown is open, clicking the daterangepicker element should close/hide the Bootstrap dropdown
- When a daterangepicker is open, clicking a Bootstrap dropdown element should close/hide the daterangepicker.
Merge pull request #268 from elasticsales/endofday

Make endDate represent the end of the chosen date/range
Merge pull request #270 from elasticsales/dropdowninteraction

Plays nicely with Bootstrap dropdowns
Merge pull request #269 from elasticsales/cleanup

Code cleanup; use CSS where possible