Have --debug set the debug level on the logging module.
Have --debug set the debug level on the logging module.

When running with --debug, the logging module will now also be set to
show debug messages. This is useful in particular for hg right now, as
we'll get more useful information out of it.

Reviewed at http://reviews.reviewboard.org/r/2997/

davidt/rbtools,reviewboard/rbtools,reviewboard/rbtools,beol/rbtools,davidt/rbtools,beol/rbtools,reviewboard/rbtools,haosdent/rbtools,halvorlu/rbtools,haosdent/rbtools,clach04/rbtools_0.4.1,halvorlu/rbtools,Khan/rbtools,clach04/rbtools,datjwu/rbtools,datjwu/rbtools,datjwu/rbtools,davidt/rbtools,bcelary/rbtools,halvorlu/rbtools,Khan/rbtools,beol/rbtools,haosdent/rbtools,1tush/rbtools