Turn color_from_hls and from_pixel into functions
Turn color_from_hls and from_pixel into functions

These are meant for creating a new Color instance and should therefore
be used the same way as color_from_string.

pmarti/pyclutter,pmarti/pyclutter,GNOME/pyclutter,pmarti/pyclutter,pmarti/pyclutter,GNOME/pyclutter