Fixed keyboard clipping on iPad

Fixed keyboard shrinking on iPad.

- Fixed cursor alignment on Take-Off screen
- Added Generate PDF report feature.

Added a clear all option for reseting all data including the infiltration parameters.

Updated look.  Gas furnace efficiency, altitude, and sensible heat ratio are now set with more convenient controls.

Maintenance update and minor bug fix

Bug fixes

- Update for swift 2.0.
- Minor formatting updates
- Fixed inability two multiply two or more non-whole numbers.

Bug Fixes