Fix plugins resolution on CircleCI

Author: ochafik

project/plugins.sbt

@@ -1,3 +1,9 @@
+// See: http://www.scala-sbt.org/0.13/docs/Resolvers.html
+
+Resolver.typesafeRepo("releases")
+
 addSbtPlugin("com.typesafe.sbt" % "sbt-scalariform" % "1.3.0")
 
 addSbtPlugin("com.typesafe.sbt" % "sbt-pgp" % "0.8.2")
+
+addSbtPlugin("org.ensime" % "ensime-sbt-cmd" % "0.1.4")