Add new sample for testing logisima-yml
Add model and sample data

Followed guide for sample YABE application up to end of
http://www.playframework.com/documentation/1.2.7/guide2.
Add initial data

Initialize database on startup if not already populated.
Get YABE sample working with YAML Export Test

Added sample YmlExtractor Test to YABE sample application to test
functionality of main project.