Merge pull request adafruit#33 from FoamyGuy/overlay_scale

Overlay scale

Merge pull request adafruit#31 from FoamyGuy/overlay_pos

Overlay position

Merge pull request adafruit#28 from FoamyGuy/overlays

Overlay feature and example

Merge pull request adafruit#29 from dhalbert/circuitpython-update-check

Check for inconsistent CIRCUITPY and display CircuitPython update message

Merge pull request adafruit#23 from adafruit/blendmode

Add demonstration of bitmafilter.blend

Merge pull request adafruit#16 from adafruit/image-processing

Image processing

Merge pull request adafruit#15 from adafruit/enhancements

Various enhancements

Merge pull request adafruit#12 from adafruit/speaker-mute

mute needs to be output, or tone does nothing

Merge pull request adafruit#9 from caternuson/iss1

Fix horizontal flip in camera example

Merge pull request adafruit#6 from adafruit/remove-unused-constants

Remove some unused constants