Select a calendar to sync :)
CalendarHelper is created to help the app manipulate calendars and
support the sync function.
Merge remote-tracking branch 'origin/master'

Conflicts:
	LetsDo/src/nz/alex/letsdo/BasicListAdapter.java
	LetsDo/src/nz/alex/letsdo/MainActivity.java
	LetsDo/src/nz/alex/letsdo/TaskSource.java