Merge pull request #2 from bloodearnest/master

Split out directories-and-permissions from wsgi-app role. Thanks Simon.
Merge pull request #3 from bloodearnest/master

Add support for service groups to nrpe role
update to latest charm-helpers
Merge pull request #5 from bloodearnest/master

Better log file handling (with defaults) and remove obsolete tasks from wsgi-app.
Merge pull request #6 from bloodearnest/update-charmhelpers

Update to latest (yet-to-land) charm-helpers branch at lp:~michael.nelson/charm-helpers/fix-for-bloodearnest
Only download or copy a payload archive if it does not yet exist at the
destination.

Move two wsgi-app tasks over from the payload role.
Update payload to additionally support swift credentials for obtaining a fresh token when downloading