Fix: Add documentation for ws_set_get()
Fix: ws_set_get() to get one ref on the returned object
Moved ws_image_buffer to ws_buffer
Added signum macro
Merge pull request #146 from matthiasbeyer/fix-set_get_refcnt

Fix ref counting in ws_set_get()
Implemented the ws_image_buffer as ws_object
Merge pull request #138 from TheNeikos/move-ws_image_buffer_to_ws_object

Move ws image buffer to ws object
Added size to ws_image_buffer
Move all variable references to their new value

This commit moves the top level variables `map` to its current situation, which
is a ws_image_buffer now