merge fixes
optimize drawing of profile view
add path caching for better drawing performance
fix lag in showing alert view because not on main thread...apparently
add utility method to  gdal utility
cache gdal datasets so that we only ever open/close each one one time
populate a table view with all of the old tracks
optimize drawing of profile view and label
misc changes
add gitignore
remove scheme from git
modify gitignore
add speed view to project
change speed/elevation text to be bold and outlined
add OSX functionality to profile view
make speed view OSX compatible
Merge remote-tracking branch 'origin/master' into gdal
Merge branch 'master' into gdal
fix merge
Merge branch 'master' into gdal