Igcs 136 ardrone ftp

** NOT READY TO BE MERGED YET* 

Opening PR so @cnatoli and @andymoe  can follow along and provide feedback if asked.
Hey @leskowicz some feedback. Don't be afraid to use more descriptive method names in Objective-C. Tend toward readable descriptive method names instead of the abbreviations.

See: https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/CodingGuidelines/Articles/NamingBasics.html#//apple_ref/doc/uid/20001281-BBCHBFAH