Add support for Parse push notifications. Modify Apptentive.setPendingPushIntent() to handle Parse push Intents, since they are formatted differently than other supported push providers. Add javadoc. This change will most likely not be final, as we need to support better namespaced intent action names, or come up with a different solution for intercepting opened pushes.
Refactor the repo to be more gradle friendly. Move all sample projects into a samples/ directory. Include gradle files for the sdk, main dev app, and example app.