Add active android

Should probably get some of this stuff in sooner rather than later as it contains some important stuff, and also some big API changes.

- Added [ActiveAndroid](https://github.com/pardom/ActiveAndroid) dependency
- Updated DataManager interface to work with persistence a little better
- Fixed up missing app name for the app.
- Removed SurveyDetail class
- Created database models for `Contact` `Survey` and a join model for `SurveyContact`
- Added utility class `IntRange` to make it easy to loop between numbers without doing unsightly for loops.
- Removed the `MockDataManager` class