remove @JsonProperty generation

* Do not clobber user provided @JsonProperty annotations.

* Eliminate processor dependency on jackson-annotations.
s/AutoMatterField/AutoMatter.Field/

Avoid autocomplete confusion when typing @AutoMa... and getting
offered both @AutoMatter and @AutoMatterField.
jackson: verify serialization configurability
Merge pull request #5 from danielnorberg/dano/no-json-properties

remove @JsonProperty generation