Explicitly synthesizing properties for xcode 4.3.2 (LLVM 3.2) compilers

The compiler in Xcode 4.3.2 uses LLVM 3.2 compiler and allows for auto synthesize of properties but at runtime the code fails and throws a "doesNotResponseToSelector" error.  Instead of using implicit property synthesis it is better in this case to make it explicit to support earlier versions of the compiler and Xcode.

I am using this on an internal project where I do not have access to updating the build server, thus I needed to make this change so I could deploy the app in the enterprise.