Merge pull request #48 from greboid/feedback-site

Use php5-fpm-nginx role.
Merge pull request #49 from greboid/feedback-site

Use new php role.
Sentry needs sentry :-)
Add vars for sentry deployment.

This includes a vault-encrypted vars file containing the GitHub
client ID and secret.
Stick the command to run playbooks in README.
Merge pull request #50 from csmith/master

Use new sentry role and define vars.
Add new settings for sentry roles.
Revert hostname change
Merge pull request #51 from csmith/master

Add new settings for sentry roles.