Combined the code from CrudListActivity into CrudActivity.

This enables simplifying the application to a single Activity class, which makes it easier to extend
and customize, will simplify AndroidManifest.xml.
Remove CrudListActivity in favor of CrudActivity.

This simplifies the application to a single Activity class, which makes it easier to extend
and customize.  Also simplifies AndroidManifest.xml.
Fix to using option map.