Ticket 76: Add v7 appcompat support library

Add v7 appcompat support library in preparation for implementiong an
ActionBar.
Ticket 76: Add JAR files for v7 appcompat support library
Issue #95: Modify BaseballCardList` to extend `ActionBarActivity'
Issue #95: Modify `option.xml`

Modify `option.xml` to indicate which menu items should be on the
`ActionBar`.
Issue #95: Implement `ActionBar`
Issue #95: Request codes
Issue #95: Use request code integer resources
Issue #95: Formatting
Issue #95: Use request code resources
Issue #95: Fix `testMenuItem()` to work with ActionBar
Issue #95: Initialize `filterRequest` and call `setEmptyListView()`
Issue #95: Can no longer cast `BaseballCardList` to `ListActivity`

Need to use `findViewById()` rather than `getListView()`.
Issue #95: Register the `OnListItemClickListener`
Issue #95: Refactor `testMenuItem()`

Refactor `testMenuItem()` for use with menu items which do not launch
another Activity.
Issue #95: Disable hidden menu items
Issue #95: `invalidateOptionsMenu()`
Issue #95: Replace tabs with spaces
Issue #95: `savedSelection` should not be static
Issue #95: Fixed error in `onResume()`
Issue #95: All activity classes now extend `ActionBarActivity`