Removed core data
Switched over to NSCoding/NSCoder
Initial Fuel Tank (no ui yet)
- FuelTanks are classes
- FuelTanks are self managing
- Things are vertical now
save last values on tabs/full clicks.
- made diamond plate not have edges
- made fuel tank sliders not accept user interaction
- made fuel tank text values have the right font
- made sure to nil out all of the properties for the view controller
- Clean up the ui
    - Carbon fiber for the tanks
    - Regular brushed metal for the control backing
- Added icon
- Changed the fuel level tracking over to the fixed width type called FuelValue
- Fixed but where setting full or tabs would not update tank diff
- Switch to using NSCopying and NSMutableCopying for FuelValue
- Switch to using ARC property attribute "copy" for the member variables of FuelValue
- Only support portrait right side up orientation
- Put some sample code at the top of the tank to reference for drawing later
- Round the tank values from float.  We were getting stuck and not being able to increment the fixed point values from the floating point because of round error
- Make sure the both stepper is incrementing at 0.1
- Added fuel ruler, including arrows and projections
* Still need to add dashed lines and values text
- Just one projected point
- Don't do switchovers and projections when not on
- Programatically create fuel ruler based on the both slider rect
- Correctly set the full fuel for the ruler when we change it from prefs
- Draw the pink lines for projected
- Got the text (with colors!) working in the ruler.  Ruler is now wholly programmatically created, including labels and text values.
- Save the value tabs, value full, target diff
- Allow setting the targetDiff
- Did some color work
- Fixed the memory validity issues around displaying the values on the ruler
- Moved the layout around to put the current used and remaining on top of the total slider.
- disable options button when InFlight
- make tabs and full buttons big
- move options button to the bottom
-  Only save values when "Touch Up *" happens on the slider or the stepper is invoked.  Before this, it was saving for each data point along the slider path - too much!
- save active tank