You are adding it as a maven repository but in your old config you are saying that it is ivy repositories, I think it should be something like:
resolvers += Resolver.url("Repo-name", url("http://example.com/"))(Resolver.ivyStylePatterns)
Checkout the sbt 0.13 (which play 2.2 uses) docs on resolvers for more info: http://www.scala-sbt.org/release/docs/Detailed-Topics/Resolvers.html