Version 3.

Major changes, new files, changes on existing files.
New SingleFragmentActivity abstract class designed to support fragment activities.
New list_item_crime layout organizes list items.
New CrimeLab class follows a singleton pattern and stores Crime objects.
New CrimeListFragment class handles the new list interface of the app.
New CrimeListActivity extends from SingleFragmentActivity.
Changes on CrimeActivity to reuse SingleFragmentActivity code.
Changes on Crime to Override toString().
Changes on AndroidManifest so that the main Activity is CrimeListActivity for now.
Other minor changes.