apache/spark — pull request #3817 by sarutak (2014-12-28 04:29:46+00:00)
Title: Adde LICENSE Header to build/mvn, build/sbt and sbt/sbt

Recently, build/mvn and build/sbt are added, and sbt/sbt is changed but there are no license headers. Should we add license headers to the scripts right?
If it's not right, please let me correct.

This PR doesn't affect behavior of Spark, I don't file in JIRA.