ANNOUNCE: New build script ./build/mvn

Hi All, A consistent piece of feedback from Spark developers has been that the Maven build is very slow. Typesafe provides a tool called Zinc which improves Scala complication speed substantially with Maven, but is difficult to install and configure, especially for platforms other than Mac OS.

Re: ANNOUNCE: New build script ./build/mvn

Linkies for the curious: - SPARK-4501 https://issues.apache.org/jira/browse/SPARK-4501: Create build/mvn to automatically download maven/zinc/scalac - https://github.com/apache/spark/pull/3707 - New build folder (mvn and sbt): https://github.com/apache/spark/tree/master/build Nick