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Merge pull request #490 from craigcalef/master

accept 'y', 'yes', and 't' for true, and 'f', 'no', and 'n' for false.
Fixes #491, this moves to the unified str_to_bool and extends it with extra boolish strings
pep8
doc updates
make the netapp collectors support optional imports
Whoops. C on the brain...
pep8
Merge remote-tracking branch 'brightcove/master'

Conflicts:
	bin/diamond-setup