Add initial implementation of wayland singleton
Add locking mechanism to singleton
Add non-blocking method for retrieval of the display
Add socket initialisation method and handlers
Add method for retrieving serial
Add note about libev and wayland event loop
Add doxygen grouping information to header
Set up socket in main function.
Fix: Move deinit-callback typedef
Fix: Typedef should be a function ptr
Merge pull request #83 from neithernut/add-wayland-globals

Add wayland globals
Merge pull request #101 from matthiasbeyer/fix-value

Fixes for the values/value.h header
Add interface definition for NIL value type
Add implementation for ws_value_nil_init()
Add CMakeLists.txt entry