CIRCLE / cloud

without the load the sliders weren't set, but clicking on customize
would load the js again and that would attach the click event twice

Conflicts:
	circle/common/models.py

Fab can't work with a #! as "#!/usr/bin/env fab -f" would be three words,
which is not supported by Linux

Feature Nose

80s -> 45s on my devenv

Handle and use HumanReadableExceptions

remove most check_precond() methods

to support HumanReadableException