Dynamic loading of Metadata Templates on start, and the ability to
configure paths with fallback to Embedded templates
Refractor Metadata custom path handling to avoid too many if conditions
Refactor custom path handling to avoid too many if conditions
Merge branch 'master' of https://github.com/prasannavl/ServiceStack
Merge pull request #780 from prasannavl/master

 	Dynamic loading of Metadata templates on start, and the ability to configure paths with fallback to embedded templates