[Refactor] Photograph : Added new method to test access to photo based on a person. Refactored method to test access to photo based on current user to user the previous method.
[New-Feature] Added jersey endpoint to access photos of users
Merge pull request #44 from NunoPinheiro/master

Refactor Photo API
Closes #41: Solved issues related to the usage of getAttends() and implemented changes in selectiveDownload()