Animate change month, add onDateLongClick, add monthTitleTextViewOnClickListener



- I've added an onLongClickDateListener so the longClickEvent can also be used
- I've also added a monthTitleTextViewOnClickListener so you can react if the user clicks on the date (in combination with a date-selection-dialog this is a quick solution to jump to a specific date)
- There's also a custom setAnimatedScroller to animate the change date (if you swipe to less it will animate back too)
- The last change are new drawables to clean up the CaldroidView (especially a onClick-graphic for the next/back buttons on top)

Sorry this is my first pull-request. I tried to make it as simple as possible.