Improvements to rubber:tail_logs

- Include host name at the beginning of each line
- Insert blank line between log entries from different hosts
- Gracefully exit when ctrl-c is pressed
Upgraded to the latest Ubuntu 12.04 LTS image.
Don't fail starting a service if it's already running.
Preparing for the 2.2.3 release.
Merge pull request #296 from willkoehler/tail_logs_improvements

Improvements to rubber:tail_logs
'service mysql status' doesn't return an error status code if the server isn't running, so this check won't work as intended.
Preparing for the 2.2.4 release.
Oops.  Don't try to deploy to TorqueBox twice.
Merge branch 'master' of github.com:rubber/rubber
fix homepage url
Merge branch 'master' of github.com:rubber/rubber
fixed typo: cloud_provider -> cloud_providers
added nginx_log_dir in rubber-nginx.yml to specify log dir of nginx
added rotate_logs task for mongodb to crontab
added rotate_logs task for memcached to crontab
Update nginx and passenger to the latest versions

Also add HTTP_X_QUEUE_START for NewRelic
Upgrade redis to 2.6.11
Merge pull request #310 from romanbsd/update_redis

Upgrade redis from 2.4.18 to 2.6.11.
Merge pull request #309 from romanbsd/update_nginx

Update nginx and passenger to the latest versions
honor host option, add fakeroot option