Today List is functional

Today List is functional.
- adding a task to a list also adds it to the today list in sorted
order.
- editing the details of a task causes the today list to be resorted.
Added persistence with ActiveAndroid

- remove Parse
- refactored Task, TaskList and TaskLists to use ActiveAndroid
- modified TodoActivity to load model using AsyncTask.
- THIS IS NOT DONE: I still get a crash when trying to view the loaded
task.  The TaskLists work, but not the Task.
Changes now update the TodayList

1) Changes created by TaskDetailsDialog are now saved and propagate to
the TodayList.
2) TodayList now updates on startup.
3) SortOrder now works correctly.
TaskListAdapter passes TaskList name to callbacks

-TaskListAdapter passes TaskList name to callbacks.
- TaskDetailsDialog has title.
- Can open TaskDetailsDialog from the TodayFragment.