Catch keyerror when websocketerror happens with unregistered socket.
send images to browser

don't forget to change the ws endpoint in index.html
run from parent directory with
python -m wear-connect.test.test-image-source

The jpeg needs to be base64 encoded, I haven't done that yet, so the
data won't be displayed properly
change order of image message args to work with browser client
Merge branch 'master' into mobile_touch
fixed touchend to  avoid tagging when touch ends in image tiles bar