Merge tag 'v0.5.0'

[maven-release-plugin]  copy for tag v0.5.0
update version to 0.5.0 in README and example files
Merge tag 'v0.6.0-develop'

[maven-release-plugin]  copy for tag v0.6.0-develop

Conflicts:
	README.md
	examples/import/pom.xml
	examples/import_deprecated/pom.xml
	examples/simpletasks1/pom.xml
	examples/simpletasks1_deprecated/pom.xml
Merge branch 'master' of github.com:PredictionIO/PredictionIO-Java-SDK into develop