Revel v0.19.0 release

Maintenance Release

This release is focused on improving the security and resolving some issues.

There are no breaking changes from version 0.18

[revel/cmd]

• Improved vendor folder detection revel/cmd#117
• Added ordering of controllers so order remains consistent in main.go revel/cmd#112
• Generate same value of AppVersion regardless of where Revel is run revel/cmd#108
• Added referrer policy security header revel/cmd#114

[revel/modules]

• Added directory representation to static module revel/modules#46
• Gorp enhancements (added abstraction layer for transactions and database connection so both can be used), Added security fix for CSRF module revel/modules#68
• Added authorization configuration options to job page revel/modules#44

[revel/examples]

• General improvements and examples added revel/examples#39 revel/examples#40