HAMA-671: Clean up Maven build scripts

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1500598 13f79535-47bb-0310-9956-ffa450edef68


git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1500607 13f79535-47bb-0310-9956-ffa450edef68
HAMA-775: Disable compression option in hama-default.xml

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1500635 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'trunk' of http://github.com/apache/hama into trunk

Conflicts:
	pom.xml