Calculations, with Bootstrap starting us off.
Merge remote-tracking branch 'upstream/master' into calculation
Added convenience methods; bootstrapping example.

Convenience methods for volume set, ensemble set, and OneWayShooterSet.
Bootstrapping seems to be working in the ala_dipeptide example, too.
Merge pull request #45 from dwhswenson/calculation

Calculations & Factories
Merge remote-tracking branch 'upstream/master' into volume_tests

Conflicts:
	opentis/tests/testorderparameter.py