Add log level to ws_log() call
Add log level check for ws_log()
Add ENV reading for logging verbosity
Add log lvls in ws_object implementation
Add log lvl in ws_buffer_blit()
Add log lvls in ws_monitor_populate_fb()
Add log lvls for frame buffer implementation
Add log lvls for ws_image_buffer_from_png()
Add log lvls in ws_framebuffer_device_new()
Add log lvls for compositor module main file
Merge pull request #213 from matthiasbeyer/add-log_levels

Add log level support