Add method for getting a surface from a resource
Add initial version of shell surface datatype
Add wayland shell surface interface implementation stubs
Add constructor
Add files for wayland shell interface implementation
Add wayland shell interface stubs
Add initialisation of wayland shell
Implement method for getting a shell surface
Initialize wayland shell from ws_compositor_init()
Merge pull request #203 from neithernut/add-compositor-wl_shell

Add compositor wl shell