add a timer to report the time used to distribute

run-argonnite-1 tooks 20 min in test 2014-07-13-22:52:42.
This was probably due to I/O.

Link: https://github.com/GeneAssembly/biosal/issues/404
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>