title: sbt build failed for spark scala with xgboost
body: <p>./build/sbt clean package
  gives the below error:</p>
  
  <pre><code>Resolving org.fusesource.jansi#jansi;1.4 ...
     [warn]   ::::::::::::::::::::::::::::::::::::::::::::::
     [warn]   ::          UNRESOLVED DEPENDENCIES         ::
     [warn]   ::::::::::::::::::::::::::::::::::::::::::::::
     [warn]   :: ml.dmlc.xgboost#xgboost4j_2.10;0.7: not found
     [warn]   :: ml.dmlc.xgboost#xgboost4j-spark_2.10;0.7: not found
     [warn]   ::::::::::::::::::::::::::::::::::::::::::::::
  </code></pre>
  
  <p>build.sbt looks like below:</p>
  
  <pre><code>name := "xgboostproj"
  version := "1.0"
  libraryDependencies += "org.apache.spark" %% "spark-core" % "1.6.1"
  libraryDependencies += "org.apache.spark" %% "spark-mllib" % "1.6.1"
  resolvers += Resolver.mavenLocal
  libraryDependencies += "ml.dmlc.xgboost" %% "xgboost4j" % "0.7"
  libraryDependencies += "ml.dmlc.xgboost" %% "xgboost4j-spark" % "0.7"
  </code></pre>
  
  <p>Thanks in Advance!</p>