Prevent an error loading blocks with bubbles (comments) with Firefox.

Change-Id: Ide8bbf2c607cc157afaebec6ae2eb062d1d30eec
Convert NanoHTTPD to use a ThreadPoolExecutor.

Use a ThreadPoolExecutor to handle incoming http requests rather then
spawning a new thread for each request. Get rid of the large stack
size thread groups, we don’t need them anymore. All Scheme operations
are now on the UI Thread which already has a bigger stack.

Change-Id: I20710b6d014001be54333a6a0f7bdaabd9c8d5ce
Update Companion Version

Change-Id: Ia5177f2456e6895c9634c40e22af5e5b0b521b8e