Added Market Depth and argument short-cuts to counterpartyd.py

I'm pretty new to open-source & git-hub (never used before) but I added a feature (market depth, and argument shortcuts) and figured others might like it too.

Thing is, I was working off of develop from like a day or two ago, and my code was working great.  But, then, I went to commit and noticed a bunch of changes to counterpartyd.py.  When I tried to test with the latest, my database got reset.  So, I stick handled my new code, into the latest counterpartyd.py.  The changes are trivial, but it technically hasn't been tested with the latest master or latest develop.  (My machine is rebuilding the DB)

I wanted to share before you guys changed Counterpartyd.py too much again.

Please don't be afraid to point out if I did something stupid.  I'm really new to contributing to open source projects.  But, I work with python everyday for my 9 to 5.