Setting ONLY_ACTIVE_ARCH=NO when compiling on command line

In the past, I've always specified `ONLY_ACTIVE_ARCH=NO` in my xcconfig files for debug builds, so that they would build correctly on the command line.

*Xcode 5* complains about this and wants to set `ONLY_ACTIVE_ARCH=YES` for performance reasons. I tend to agree, since I build and run from Xcode much more often than I run the frank build from the command line.

I set it here where we call the xcodebuild command rather than in the `frankify.xcconfig` as I seem to remember having problems with dependent projects not building properly when I used an xcconfig as it is applies the settings all the way down the xcodeproj dependency chain.