Merge pull request #427 from pwendell/deprecate-aggregator

Deprecate rather than remove old combineValuesByKey function

(cherry picked from commit d601a76d1fdd25b95020b2e32bacde583cf6aa50)
Signed-off-by: Reynold Xin <rxin@apache.org>
Merge pull request #429 from ankurdave/graphx-examples-pom.xml

Add GraphX dependency to examples/pom.xml

(cherry picked from commit 193a0757c87b717e3b6b4f005ecdbb56b04ad9b4)
Signed-off-by: Reynold Xin <rxin@apache.org>
Merge pull request #428 from pwendell/writeable-objects

Don't clone records for text files

(cherry picked from commit 74b46acdc57293c103ab5dd5af931d0d0e32c0ed)
Signed-off-by: Reynold Xin <rxin@apache.org>
Small change to maven build