disabled Choose Which Game dialog in ConfirmGameFragment
removed mentions of chess from settings
added isValidFragment() method to BasePreferenceActivity

needed for security reasons
removed "My Stats" menu item
updated version name and version code

versionCode="32" versionName="1.7.0"
Classy Games v1.7!
Merge pull request #11 from ScootrNova/v1.7.0-update

V1.7.0 update