foreground keyword. fix #25
added background (_bg) test
basic tests pass, but no confidence that the refactoring is solid yet
Merge remote-tracking branch 'jzib/_fg' into dev
adding a __len__ to command objects
added _fg special kwarg.  closes #25
updating to version 0.80
removing auto-globbing, closes #23
Merge branch 'dev'
version 0.81
Merge branch 'master' into dev
Merge branch 'dev' into refactoring_command

Conflicts:
	pbs.py
call_args doesn't exist in Command object anymore
clarification on no auto-globbing
Merge branch 'dev'
escaping the glob in the readme (lol), so markdown doesnt see it as emphasis
Merge branch 'dev'
one more time now...
Merge branch 'dev'
no need to check callargs on command object with context