CSS Compatibility Fixes

- Tweaked CSS for better compatibility with IOS and pre-4.4 Android and
to address bug text issues
- Removed  target-densitydpi=device-dpi from meta viewport
since it was not being used and was causing problems with older
platform.
- Added back ajax indicator border, but leaving hidden on first slide
of welcome screen
- Added cordova StatusBar plugin to get white text in status bar area
on IOS 7