Added optional length parameter to ScreenRenderer.__init__
Initial commit of LPD8806 bitbang renderer.  Doesn't work yet, still needs functions to set pins to high and low.
Added RPi GPIO code to the renderer, untested
Added RPi GPIO code to the renderer, untested
Changes.  Tested, seems to work.
Changed REST server config to be open to all connections, not just localhost
Merged branch 'LPD8806'