title: SBT PublishM2 do not refresh snapshot jar in local maven repo
body: <p>I have a simple Sbt project</p>
  
  <pre><code>name := "xxxx"
  
  organization := "xxxxx"
  
  version := "0.0.2-SNAPSHOT"
  
  scalaVersion := "2.11.6"
  
  
  
  resolvers += "spray repo" at "http://repo.spray.io"
  
  
  scalacOptions in ThisBuild ++= Seq("-language:postfixOps", "-feature")
  
  
  
  libraryDependencies ++=
    Seq("io.spray" %% "spray-client" % "1.3.3",
        "io.spray" %%  "spray-json" % "1.3.2",
        "com.typesafe.akka" %% "akka-actor" % "2.3.11",
        "org.dspace" % "dspace-api" % "1.8.2",
        "org.scalatest" %% "scalatest" % "2.2.4" % "test")
  </code></pre>
  
  <p>When i do publishLocal, my snapshot is always updated in Ivy, however when i do publishM2 it does not work. I check the source jar in the .m2 folder and it is never updated. I have to delete manually the folder of my artifact in my local .m2 folder, then do the publication again. </p>
  
  <p>Is there a way to have sbt replace the jar in the .m2 folder using PublishM2 ?</p>