Began Question class

Beginning Question class in nidaba.core.question.Question
Created Question signature

Have got a basic working Question object which can be passed a dict and also a list of Answers.
Added Answer object

Added basic Answer object. Also changed the Question object so that it accepts the answer details as a dict and then creates a list of Answer objects.
Fixed Question object
Moved objects from individual files into an objects file.
Added Comment object
Modified __data to _data
Merge pull request #14 from sopython/question_object

Merging #14