minor cleanup
urls and views to allow miner/lag/ plot to be customizable
Add feature to allow selection of lag plot type (hist, CMF, PMF, CDF

URLs that work:
http://bigdata.enet.sharplabs.com:8000/miner/lag-cmf/?fy=2013&r=R,R10,R11,R12,R13&mn=LC
http://bigdata.enet.sharplabs.com:8000/miner/lag-hist/?fy=2013&r=R,R10,R11,R12,R13&mn=LC
http://bigdata.enet.sharplabs.com:8000/miner/lag/?fy=2013&r=R,R10,R11,R12,R13&mn=LC

URLS that don't work (PMF and CDF display flatlines at zero):
http://bigdata.enet.sharplabs.com:8000/miner/lag-pmf/?fy=2013&r=R,R10,R11,R12,R13&mn=LC

Merge branch 'master' of github.com:hobson/pug

Conflicts:
	pug/miner/views.py