Updating versions of json and jackson libraries

Updating libraries (all unit tests are passing)

jackson-databind (2.1.5  ->  2.2.3)

json-schema-validator (2.1.6  ->  2.1.7)

Full release notes can be found:
https://github.com/FasterXML/jackson-databind/blob/master/release-notes/VERSION
https://github.com/fge/json-schema-validator/blob/master/RELEASE-NOTES.md