title: Build.sbt breaks when adding GraphFrames build with scala 2.11
body: <p>I'm trying to add GraphFrames to my scala spark application, and this was going fine when I added the one based on 2.10. However, as soon as I tried to build it with GraphFrames build with scala 2.11, it breaks. </p>
  
  <p>The problem would be that there are conflicting versions of scala used (2.10 and 2.11). I'm getting the following error:</p>
  
  <pre><code>[error] Modules were resolved with conflicting cross-version suffixes in {file:/E:/Documents/School/LSDE/hadoopcryptoledger/examples/scala-spark-graphx-bitcointransaction/}root:
  [error]    org.apache.spark:spark-launcher _2.10, _2.11
  [error]    org.json4s:json4s-ast _2.10, _2.11
  [error]    org.apache.spark:spark-network-shuffle _2.10, _2.11
  [error]    com.twitter:chill _2.10, _2.11
  [error]    org.json4s:json4s-jackson _2.10, _2.11
  [error]    com.fasterxml.jackson.module:jackson-module-scala _2.10, _2.11
  [error]    org.json4s:json4s-core _2.10, _2.11
  [error]    org.apache.spark:spark-unsafe _2.10, _2.11
  [error]    org.apache.spark:spark-core _2.10, _2.11
  [error]    org.apache.spark:spark-network-common _2.10, _2.11
  </code></pre>
  
  <p>However, I can't troubleshoot what causes this.. This is my full build.sbt:</p>
  
  <pre><code>import sbt._
  import Keys._
  import scala._
  
  
  lazy val root = (project in file("."))
  .settings(
      name := "example-hcl-spark-scala-graphx-bitcointransaction",
      version := "0.1"
  )
   .configs( IntegrationTest )
    .settings( Defaults.itSettings : _*)
  
  scalacOptions += "-target:jvm-1.7"
  
  crossScalaVersions := Seq("2.11.8")
  
  resolvers += Resolver.mavenLocal
  
  fork  := true
  
  jacoco.settings
  
  itJacoco.settings
  
  
  
  assemblyJarName in assembly := "example-hcl-spark-scala-graphx-bitcointransaction.jar"
  
  libraryDependencies += "com.github.zuinnote" % "hadoopcryptoledger-fileformat" % "1.0.7" % "compile"
  
  libraryDependencies += "org.apache.spark" %% "spark-core" % "1.5.0" % "provided"
  
  libraryDependencies += "org.apache.spark" %% "spark-graphx" % "1.5.0" % "provided"
  
  libraryDependencies += "org.apache.hadoop" % "hadoop-client" % "2.7.0" % "provided"
  
  libraryDependencies += "javax.servlet" % "javax.servlet-api" % "3.0.1" % "it"
  
  
  libraryDependencies += "org.apache.hadoop" % "hadoop-common" % "2.7.0" % "it" classifier "" classifier "tests"
  
  libraryDependencies += "org.apache.hadoop" % "hadoop-hdfs" % "2.7.0" % "it" classifier "" classifier "tests"
  
  libraryDependencies += "org.apache.hadoop" % "hadoop-minicluster" % "2.7.0" % "it"
  
  libraryDependencies += "org.apache.spark" % "spark-sql_2.11" % "2.2.0" % "provided"
  
  libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.1" % "test,it"
  
  libraryDependencies += "graphframes" % "graphframes" % "0.5.0-spark2.1-s_2.11"
  </code></pre>
  
  <p>Can anyone pinpoint which dependency is based on scala 2.10 causing the build to fail?</p>