I finally was able to get chartboost working on an iPhone. Thank you for all of your help. Here are the steps I did to get it to work so if questions come up again about this.
1) Download Godot 2.1 source.
2) Download mamau_chartboost source.
3) Add mamau_chartboost to Godot source folder per the instruction on the mamau_chartboost github page.
4) Compile Godot per Godot's direction for OSX.
5) Compile the Godot IOS template.
6) Setup a chartboost account and get the app id and app signature.
7) Add both the app id and app signature to the engine.cfg in the mamau_chartboost example per instructions. They must be in quotes.
8) Load mamau_chartboost example and export it per Godot's IOS export directions.
9) Setup and compile in Xcode per Godot's directions.
10) Load onto iPhone