Add object-attribute-writing-mechanism
Add test for attribute writing
Merge pull request #625 from matthiasbeyer/add-object_attr_writing_mechanism

Add object attribute writing
Add support for accessing booleans from objects
Add mapping from attribute to value-type
Added missing comments in object documentation
Add implementation for ws_value_set to string
Merge pull request #589 from matthiasbeyer/add-set_tostr

Add implementation for ws_value_set to string
Add attribute reading in buildin commands
Add builtin command for attribute writing of objects
Merge pull request #626 from matthiasbeyer/rewrite-abstract_shell_surface_attr_accessors

Refactor attribute accessors
Add warning to wayland buffer

...to prevent devs from using it as a `ws_buffer` and filing bug-reports
because the method segfaults.
Fix wayland buffer usage in surface commit code
Merge pull request #634 from neithernut/add-compositor-wayland-buffer-warning

Add warning to wayland buffer
Add zindex member for surface
Merge pull request #623 from matthiasbeyer/add-zindex

Add zindex for ws_surface
Add method to manager for shutdown
Do not try to unlock the processor if locking failed
Rewrite portion of flushing function

...to account for
 * EWOULDBLOCK
 * logging
 * need for closing down the connection through the connection manager
Make ws_object_attr_read() consider basetype