Technical review of relations docs

[crandmck]

The relations docs need a tech review. In particular:

• Need a JSON example for hasManyThrough
• Answer question in http://docs.strongloop.com/display/LB/Polymorphic+relations
• Check correctness of JavaScript code samples for all relations.

[fabien]

@crandmck what's the question regarding Polymorphic relations?

[raymondfeng]

JSON examples added for hasManyThrough

[crandmck]

@fabien , all the questions are visible in the pages when you are logged in to Confluence. I will send you a username so you can login and see all the questions and also edit articles.

[crandmck]

Also per #718 I added a new article for hasOne, but it needs to be filled in.

[crandmck]

@fabien - any update on this? I haven't seen any edits to the docs. I've added http://docs.strongloop.com/display/LB/Contributing+to+LoopBack+documentation in case that's helpful.