make a utility library for displaying terminal output

[hakamadare]

how about instead of writing this:

print colored("Error: ", "red"), "No blueprint by that name.\nFor a list of blueprints run `nepho blueprint list %s`" % (self.app.cloudlet_name)

we instead could write this:

from nepho.core.output import error
error("No blueprint by that name.\nFor a list of blueprints run `nepho blueprint list %s`" % (self.app.cloudlet_name))

these would just be convenience methods, but would enable cleaner and more consistent code.