Minor typo in throughput experiment.
Starting to re-organize distributed experiments.  Using a config file instead of hardcoding in hostnames and keyfiles.
HostEntry now supports sending ssh commands.
Added code for producing arguments to create linear and tree topologies.
Updated latency test to use new util infrastructure.
Added usage message and pushes reusable code for tearing down partial tests to util.
Refactored distributed tests so that can reuse linear experiment for latency and throughput tests.
Added utility for scp-ing experiments directory to running host.