fixes to make py.test --marker both work and be easy to read
long_running and perf marks are handled by skipper

We have a couple things that we wanted to skip by default, and love throwing
commandline flags on stuff. This makes it easy! :D
 Updated with Quadicon.all()
Merge pull request #1285 from seandst/skipmark

Dyanmic skip marker & marker tweaks
Merge pull request #1293 from akarol/datastore

 Updated with Quadicon.all()