Bug fixing and performance update

This update from Apple will improve the functionality of this app. No new features are included.

- Fixed export function
- Fixed hangups while drawing
- Overall improvements

- Updated for iOS 7, iOS 8, iPhone 5, iPhone 6, iPhone 6+, and iPad
- Support distance input (wall length, room height) via bluetooth measurement devices

- Ability to export all rooms in a project at once.
- Enhancements in exported data.
- Correct handling of removed contacts.

Bug-fixes in drawing system and validation of user input.
"Reset App" option in settings to remove all stored data on next restart.

- General usability enhancements.
- Bug-fixes in drawing system.
- Usability enhancement in drawing system.
- Inclusion of perimeter calculation.
- Ability to take and attach photos to a room.
- Change PNG export to PNG+CSV-Table.
- Ability to Export with photos.