Git: Updated .gitignore to ignore the .gradle directory

Signed-off-by: Vincent de Smet <vdesmet93@gmail.com>
CalendarView: Added getTextViewForDate(long) method.
This allows for quickly retrieving a TextView to update it's appearance.
For example, change the appearance after clicking on it.

Signed-off-by: Vincent de Smet <vdesmet93@gmail.com>
Merge branch 'master' of github.com:vdesmet93/holo-calendar