Feature rename ofxiPhone files to ofiOS 

closes #2380 

Note: I've include #defines for all the old functions and classes pointing to the new functions and classes. 
Also kept ofxiPhone.h and ofxiPhoneExtras.h 

So old projects should work without needing code to be changed. 
All examples have been updated to show the new ofxiOS language. 

Tested this with many of the examples. 
Seems to work great. 

Think this is everything - pinging @arturoc @julapy @danwilcox @admsyn @nickhardeman 
Going to merge today unless there are objections.