New Features and fixed bugs

Hey Derek,

Very nice job!! I added that lib into my actual project but I had to modify some of your code.
Here the modif: 
* bugs fixed:
   - DatePicker : I guess you forgot to test if it a leap year  
   - DatePicker : It was annoying to click on the delete icon to modify the date. I changed to be more flexible.  
   - DatePicker : I create a new PageIndicator to be more as the new Play Store.

* New Features:
I created a new Time Picket (TimeSliderPicker) base on the DatePicker but for Time

Let me know if you like
here my email "edouard.roussillon@gmail.com"

See you
Edouard