Merge pull request #1 from bloodearnest/master

Small tweaks to wsgi-app for better reusability
Rewrite the nrpe configuration files during upgrade-charm (as it's
usually a change to the main playbook which results in changes to this
role) and signal the change to the subordinate only when the configs
change.
renamed to .yaml
Refactor wsgi-app role into 3 smaller roles.

directories-and-users: creating of users, dirs, and managing permissions
payload: fetching/extracting of payloads
wsgi-app: smaller, just wsgi stuff
Also, renamed .yml to .yaml
Merge branch 'master' of github.com:bloodearnest/charm-ansible-roles