rotate8x8

[trogper]

there's an error in rotate8x8.py when combined with scrolling
simplest repro of this would be taking "Scrolling and pixel setting..." from matrix_test.py and setting device.orientation(180) before running it
source: http://pastebin.com/jzWvuYK7

File "/usr/local/lib/python2.7/dist-packages/max7219/led.py", line 361, in _rotate
tile = rotate(tile)
File "/usr/local/lib/python2.7/dist-packages/max7219/rotate8x8.py", line 37, in rotate
assert 0 <= value < 256, 'Value {0} outside range 0..255'.format(value)
AssertionError: Value 496 outside range 0..255

[rm-hull]

ah right - looks like scroll_down just does <<1 .. it should probably & 0xff as well.

Will look at getting this fixed shortly.

Thanks for reporting!