Single-quote the master_node option

R16B doesn't like atoms with dots.
Merge branch 'master' of github.com:evanmiller/ChicagoBoss
Update boss_plugin for current rebar version
Support delivery callbacks when sending email
Merge pull request #230 from davidw/static_content_no_cache

Set Cache-Control no-cache for static resources in development mode.
Update SimpleBridge
Update to newer rebar
Fix boss_plugin
Fix template rendering in test environment
Prep for 0.8.6
Add instructions for MongoDB to README_DATABASE
Add notes about default ports for Postgresql, MongoDB and Tokyo Tyrant
Merge pull request #257 from HashNuke/database_instructions

Add database instructions for MongoDB and mention default ports databases
Merge branch 'master' into development

Conflicts:
	rebar.config