PDIO-237 Fix TrainingTestSplit for non-rate action
PDIO-239 Eliminate duplicates in output when both freshness and serendipity are non-zero
PDIO-242 Change action name 'buy' to 'conversion' in admin UI
PDIO-240 add try catch for accessing array element in mahout data prep and capture error data
PDIO-241 Disallow \t in itypes
Bump to version 0.6.3
Merge branch 'hotfix-0.6.3' into develop

Conflicts:
	bin/common.sh
	commons/build.sbt
	dist/bin/backup
	dist/bin/common.sh
	dist/bin/conncheck
	dist/bin/migration/appdata
	dist/bin/restore
	dist/bin/settingsinit
	dist/bin/updatecheck
	dist/bin/upgrade
	dist/bin/users
	dist/conf/init.json
	dist/conf/predictionio.conf
	output/build.sbt
	process/commons/hadoop/scalding/build.sbt
	process/engines/commons/evaluations/scala/paramgen/build.sbt
	process/engines/itemrec/algorithms/hadoop/scalding/build.sbt
	process/engines/itemrec/algorithms/scala/mahout/build.sbt
	process/engines/itemrec/algorithms/scala/mahout/commons/build.sbt
	process/engines/itemrec/evaluations/hadoop/scalding/build.sbt
	process/engines/itemrec/evaluations/scala/topkitems/build.sbt
	process/engines/itemrec/evaluations/scala/trainingtestsplit/build.sbt
	process/engines/itemsim/algorithms/hadoop/scalding/build.sbt
	process/engines/itemsim/evaluations/hadoop/scalding/build.sbt
	process/engines/itemsim/evaluations/scala/topkitems/build.sbt
	servers/admin/project/Build.scala
	servers/api/project/Build.scala
	servers/scheduler/conf/application.conf
	servers/scheduler/project/Build.scala
	tools/conncheck/build.sbt
	tools/settingsinit/build.sbt
	tools/softwaremanager/build.sbt
	tools/softwaremanager/src/main/scala/io/prediction/tools/softwaremanager/Backup.scala
	tools/softwaremanager/src/main/scala/io/prediction/tools/softwaremanager/Restore.scala
	tools/softwaremanager/src/main/scala/io/prediction/tools/softwaremanager/UpdateCheck.scala
	tools/softwaremanager/src/main/scala/io/prediction/tools/softwaremanager/Upgrade.scala
	tools/users/build.sbt
Merge branch 'develop' of github.com:PredictionIO/PredictionIO into develop