Rebase of 6b791cd onto devel, without DeleteCardList activity.
Ticket63, alternate design

Added checkboxes to the left side of BaseballCardList's ListView.
Added a "Delete Cards" menu option which deletes marked cards.

Rebase onto devel branch.
Ticket63, alternate, updated

Removed long click listener, added a custom cursor adapter, users can
now select checkboxes by clicking them. Rewritten all tests to work with
alternate version.
Ticket63, alternate, javadocs

Added missing javadocs.
Ticket63, alternate, corrections

Fixed imports in CheckedCursorAdapter, removed unnecessary calls to
testClearFilter() in BaseballCardListWithDataTest ..
Ticket63, alternate, more corrections

Added GPL notice to checkmark.xml, fixed indentation. removed unused
variables in CheckedCursorAdapter.

Fixed whitespace issues in checkmark.xml
Merge pull request #19 from tmatek/ticket63-alternate

Ticket63 alternate