Fix Android project properties
Remove interface @Override
Ignore .metadata
Increase minSdkVersion to avoid Lint error
Put uses-sdk before application and add targetSdkVersion
Use keepclasseswithmembers in proguard.cfg
Remove unused strings
Remove interface @Override
checkSubscriptionSupported
onBillingChecked and onSubscriptionChecked unit tests + bug fix
requestSubscription
PurchaseState.EXPIRED
Add subscription items
Update to new Dungeons look
Use requestSubscription for subscriptions
Merge pull request #77 from hpique/master

First go at subscription support + warning cleanup
Fixed isPurchased javadoc. Closes #68.
Add developerPayload to requestPurchase and requestSubscription. Closes #59.
Log signed data on debug mode. Closes #47.
AbstractBillingFragment