Add clustering, enable by default in production mode
Add cluster-enabled logging
Merge branch 'cluster' into develop
Move cache loading into request handler.
Update readme and config comments.
Merge branch 'cache' into develop
Add statsd metrics support.
Merge branch 'metrics-statsd' into develop
Fix Redis cache item encoding.
Merge branch 'hotfix-redis-encoding' into develop
Fix gif2video with new request plugin API
Fix adblock plugin with new request plugin API
Add support for optional plugins

Plugins that mark themselves as optional (via config file) can
be enabled or disabled via the 'X-Gonzales-Options' header sent
by the client. The form is "+foo -bar" to enable plugin 'foo' and
disable plugin 'bar'.
Make the default plugin config disabled

Added and enabled all of the previously implicitly-enabled plugins
Merge branch 'optional-plugins' into develop
Don't tunnel HTTPS traffic by default
Merge branch 'no-connect' into develop
Added test framework.