Support more feartures and sample

Hi, 

I want to contribute to your excellent project that helps me alot in my projects.

Features that I implemented:
+ Add OTHER LINKER FLAGS option. If we use static lib (.a) in our project, we need to specify option ObjC in OTHER LINKER FLAGS. So this option support this.
+ Add link to user framework bundle (Facebook SDK). Facebook SDK is framework bundles and need to weak link  in the project.
+ Fix bug: Optional link with framework library (add ':' to the end of frameword name)
+ Include example of projmods config file

Thanks for excellent project,