the build.sbt file is like this:

name := """DeadSample"""

version := "1.0-SNAPSHOT"

lazy val root = (project in file(".")).enablePlugins(PlayJava)

scalaVersion := "2.11.0"

libraryDependencies ++= Seq(
javaJdbc,
javaEbean,
cache,
javaWs,
"be.objectify" %% "deadbolt-java" % "2.3.0-RC1",
"com.feth" %% "play-authenticate" % "0.6.1-SNAPSHOT"
)

resolvers ++= Seq(
Resolver.url("Objectify Play Repository (release)", url("http://schaloner.github.com/releases/"))(Resolver.ivyStylePatterns),
Resolver.url("Objectify Play Repository (snapshot)", url("http://schaloner.github.com/snapshots/"))(Resolver.ivyStylePatterns),
Resolver.url("play-easymail (release)", url("http://joscha.github.com/play-easymail/repo/releases/"))(Resolver.ivyStylePatterns),
Resolver.url("play-easymail (snapshot)", url("http://joscha.github.com/play-easymail/repo/snapshots/"))(Resolver.ivyStylePatterns),
Resolver.url("play-authenticate (release)", url("http://joscha.github.com/play-authenticate/repo/releases/"))(Resolver.ivyStylePatterns),
Resolver.url("play-authenticate (snapshot)", url("http://joscha.github.com/play-authenticate/repo/snapshots/"))(Resolver.ivyStylePatterns)
)

I get an error saying

sbt.ResolveException: unresolved dependency: com.feth#play-authenticate_2.11;0.6.1-SNAPSHOT: not found