Updates for device compatibility; bump versionCode

- change minSdkVersion from 7 to 8 (Eclair to Froyo), add
targetSdkVersion at 17 - this removes a Lint warning.
- add specific non-required hardware features for tablet (N7)
compatibility
- specify that the app can be backed up - this removes a Lint warning
Update Eclipse prefs for Android app

Saved prefs from Eclipse after building without errors.