Adding the partnership retrieval code with some GET params to search by mentor/apprentice instead of by relationship
Making the changes that @fentie suggested for this piece
Added the post endpoint for partnerships
Adding the delete end point for partnerships
Adding a method to encapsulate the mentor/apprentice/partnership decision making
Fixing the serialization for the partnerships....I think
Merge pull request #60 from phpmentoring/partner_api_endpoints

Adding the partnership retrieval code with some GET params to search by mentor/apprentice instead of by relationship