Add annotations using @field scala meta annotation for case classes.

Signed-off-by: Gorka Lerchundi Osa <glertxundi@gmail.com>
Remove unused imports

Signed-off-by: Gorka Lerchundi Osa <glertxundi@gmail.com>
Merge branch 'master' of https://github.com/glerchundi/spring-data-neo4j-scala-support