Improve some relationship names

* Use lowerCamelCase instead of alllowercase for relationship names,
  such as `master.importGroup`.
* Use 's' suffix instead of '_collectin' for many-to-one
  relationships, such as `master.versions`.
* Use custom names for for some relationships, such as
  `master.originalVersion`.
Support single uuid arg in IPhotoLibrary.uuid_query
Document useful tables
Add --version option and bump version to 0.2.0