Xcode 5's suggested project changes.
Declare some private extensions to NSObject to prevent some Xcode 5 warnings about undefined selectors.
Fixed some size related warnings by using NSInteger (which should always be the same size as a pointer).

I think the code is a bit dubious though - not sure why you can't store a boxed bool value in the cache instead. That should returns NULL if it's not been set, or an NSValue object if it has (which you can then convert into a BOOL).
Reversed Xcode 5's architecture settings changes, as I think they'll cause trouble when compiling with Xcode 4.x in some situations.
Use intptr_t instead of NSInteger.
Merge branch 'master' of https://github.com/samdeane/GRMustache into samdeane-master
Remove undeclared selector warning, which is not yet robust enough in Xcode 4.
Prevent a compiler warning when building exception prevention on pthreads
Robustness of exception prevention: use NSThread for OSX, because the static lib may be used from a GC-based application, and use fast pthread for iOS, which never had support for GC.
Move private declarations out of header