Added delay after serial transfers

The radio module can't take packets quickly, so added a delay to keep
the router radio from overloading
Squawk forget me drop sig comes from server

Before, the router sent out the disconnection signal. Now the server
sends the signal
Updated router README, updated API-router.php

README was updated to include API.php installation. Also, the call path
was updated to point to the standard install path, /usr/local/bin.
Added testing info to router README
allowed devstatus to be a mask

So a device could have multiple next expected packets
Merge branch 'testing'