Updating spreg: several minor bug and documentation fixes.
Fixing Chow's test output and docs.
Merge branch 'spreg_up' of github.com:pedrovma/pysal into pedrovma-spreg_up

Conflicts:
	pysal/spreg/ml_lag.py
Merge branch 'pedrovma-spreg_up'
Merge pull request #453 from sjsrey/master

Resolving conflicts