* Add support for using Spring HATEOAS to add links in the spring generator.
* Ensure that Spring HATEOAS links appear last in the JSON serialisation of objects.
* A couple of changes following code review:
1. Make sure the @JsonPropertyOrder annotation is only used when the jackson library is being used since it's a part of the jackson library.
2. Make sure to include the Spring HATEOAS dependency in the pom file for the spring-cloud and spring-mvc generators when the hateoas option is enabled.
* Don't order the json properties since there's no requirement for the links to be last.
* Remove unnecessary import.
* Allow specifying/overriding the parent in the pom file for Java and Spring generators.
* Don't add extra whitespace to the pom file when the parent isn't overridden.
* Remove accidentally added white space.
