Layout path

May want to test this in different environments, but on my mac, I couldn't get layout_path to work when using AnotherApp.layout_path() as explained here: 

http://www.padrinorb.com/blog/padrino-0-12-0-activesupport-4-rewritten-reloader-smarter-rendering-and-loads-more

My changes are to avoid additional processing if a absolute path is set for :layout, as well as disabling the prefix of :views in front of the :layout.