Merge pull request #2 from richardrails/master

add database.yml pool setting, nginx read timeout setting
new features from community, code clean-ups, v0.2.19
added support for passenger 4, ver. 0.2.20
added licenses, ver. 0.2.21
added roles filters, new tasks in passenger, ver. 0.2.22
Merge remote-tracking branch 'upstream/master'