Add google analytics track code (PMC only)

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1549563 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'trunk' of https://github.com/apache/hama into trunk
HAMA-828: Improve code, fix typo and modify unclear comment in
org.apache.hama.ml.ann package