docs: added restoration commands for DBs

packaging: Update rc-testdata I've seen upcoming trouble with recent nixpkgs and updated the default.nix inside of rc-testdata. This change makes use of the new version for enterprise.

docs: add note about variables in webhooks.

webhooks: added variables into the call URL. Fixes #4211

integrations: sync slack/hipchat formatting

logging: remove bad logging on slack/hipchat.

integrations: fix bug with integrations view page not loading when non global admin tries to access it, fixes #4266

hipchat: escape user entered data to avoid xss/formatting problems

packaging: Tweak for darwin based development, 16.09

integrations: use consistent formatting of user in slack.