[REQ][java rest-assured] support for jackson

Created by: jmini

For the moment the java rest-assured is configured to use gson.

In some scenario using Jackson instead of gson is required. Rest-assured supports both serialization library:

REST Assured supports mapping Java objects to and from JSON and XML. For JSON you need to have either Jackson, Jackson2, Gson or Johnzon in the classpath and for XML you need JAXB. (..) It will first try to use Jackson if found in classpath and if not Gson will be used.

See https://github.com/rest-assured/rest-assured/wiki/Usage#object-mapping

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The rest-assured templates can be extend to support either jackson or gson (current default).