use default bar color on iOS7 tablets
more UI adjustments for iOS7
use 3.2.* sdk as it contains more fixes for iOS7 currently, we will switch back to 3.1.3 once it is released. I do not think we still need to specify the min-ios-version. Bumping version to 1.9.7. App runs pretty fine under iOS7 now, only one small issue remains so far which should be fixed by Titanium