Adding Opal views to aux
Adding Utilities::explode() method
Making OpalHttp request ask for data in JSON format instead of XML
Cleaning out TODO file
Removing the "Study" active record object

Aspects fo the Study object have been replaced by adding modality and other
details to the Exam active record instead.
Removing debug cout statements
Renaming Exam.Interview_Id to Exam.InterviewId
Implementing Interview::Update()
Merge remote-tracking branch 'patrick/master'