Ticket170

Checkbox state is now maintained on both orientation change and when a
different activity is launched.
Fix compiler error

Fix compiler error to match current method signature of
`BaseballCardSQLHelper.insertAllBaseballCards()`.
Ticket170, update1

Selection is now saved also after user adds a card.
Merge pull request #174 from codeguru42/premium

Fix compiler error
Ticket170, update2

Fixed test that would fail.
Android Tests: Code clean up
Merge pull request #171 from tmatek/tests

Ticket170
Android Tests: Formatting
Issue #134: Clean up imports
Issue #134: Deprecation warnings
Issue #134: Serializable warnings
Issue #134: Unchecked casts warnings
Issue #134: Unused field warnings
Merge pull request #181 from codeguru42/issue134-lint

Issue #134
Merge pull request #180 from codeguru42/edit-test

Android Tests