Enabling Maven Profile gen-scalatra
Updating the Scalatra Template for Scala 2.11

* Moved to Scala 2.11.2
* Updated the dependencies to use latest Jetty as well as Akka
* Added the SBT Dependency Graph plugin
* Build Properties now use SBT 0.13.5
* Updated the sbt executable.
Adding Echo YAML Sample
Merge branch 'feature/develop_2.0/scala_2.11' of github.com:berngp/swagger-codegen into berngp-feature/develop_2.0/scala_2.11
Merge branch 'berngp-feature/develop_2.0/scala_2.11' into develop_2.0