Strip timestamp from command before sending to vehicle.
Make all documentation and logic for timestamps agree.

This may fix #47, but I want to run some tests with trace files because
that was the only place where the logic actually changed. Those aren't
really great candidates for unit tests because we have to add real-time
delay, which can make them unpredictable.
Update Maven Javadoc plugin version.
Merge branch 'untimestamp-sending' into next
Merge branch 'next' into time-agreement
Represent timestamps as milliseconds in a long in Java-land.

When serializing to JSON, we still keep the timestamp in seconds with a
fracitonal part. That leaves open the possibility of another platform
having higher precision than milliseconds.

Fixed #47.
Bump to v5.0.0 in Android projects.
Fix spacing in fabfile.
[maven-release-plugin] prepare release 5.0.0