Add interface definition of ws_wayland_obj type
Add implementation for ws_wayland_obj_init()
Add implementation for ws_wayland_obj_new()
Add implementation for ws_wayland_obj_get_id()
Add implementation for ws_wayland_obj_get_wl_resource()
Merge pull request #87 from matthiasbeyer/add-ws_wayland_obj

[WIP] Add ws_wayland_obj type