updated maven-surefire version to 2.12.3-GD-01: solved MacOS problem.
MAPREDUCE-5012. Typo in javadoc for IdentityMapper class. Contributed by Adam Monsen.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1447865 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
MAPREDUCE-5009. Killing the Task Attempt slated for commit does not clear the value from the Task commitAttempt member (Robert Parker via jeagles)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1447965 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-YAHOO-214-trunk-gd