Outside month days clickable (#94)

* Refactored for-loop that creates the individual calendar days.

* Refactored "SPAN" listening out of click event handler.

* Single-day selection highlighting working again.

* Outside month dates showing properly - even with events.

* Refactored opacity in scss. Empty dates wont get the disabled class.

* Refactored qs-num class assignment logic.

* Merged master.

* No need for the anonymous fxn in the loop. Just needed to make sure the variables were ordered correctly - dont access values before theyre declared!

* No need for the anonymous fxn in the loop. Just needed to make sure the variables were ordered correctly - dont access values before theyre declared!

* noWeekends being handled properly.

* De-nesting styles. I think this might not be necessary. Should bring the bundle size down some.

* Event handler updated with logic to handle clicking a day on the calendar outside the current month.

* Added daterange class name logic. Refactored names to be shorter.

* Updated packages.

* Revamped webpack & sandbox.

* Needed scss all the time.

* clicking days outside calendar working.

Co-authored-by: Aaron Cordova <qodesmith@fb.com>