verbose mode to output runtime status of makeflow.

Useful for large workflows which may cause Makeflow to appear unresponsive.
Allow comments inside a rule
work_queue master keeps counter of gpu availability per worker
Merge branch 'makeflow_comment_fix'

Allow comments inside a rule.
Merge branch 'makeflow_verbose' of git://github.com/rampantmonkey/cctools into rampantmonkey-makeflow_verbose

Useful for large workflows which may cause Makeflow to appear unresponsive.
Merge pull request #278 from rampantmonkey/master_gpu_counter

work_queue master keeps count of the gpu availability and allocation just like the other resources at worker.