Fixed the redirect path in actionUpdate
Added some relations in the proposition model (rel to "question_groups" and to "surveys")
Added the "Edit the title of a proposition" functionnality
Added a feature to create a survey with a title and description
Added a feature to create a survey with a title and description
Added the "actionCreate" and "actionDelete" of the questionsController
removed application.log from git tracker
Added the functionnality to delete a question from a survey.
NOT COMPLETELY FINISHED ! I have to ask some questions to P. Hurni
Added the create question group feature

TODO: Get the survey ID automatically (see the create view)
TODO: Get the first available position (see the controller)
Merge remote-tracking branch 'origin/PouleRequestTesting' into dev
Improved the "beforeDelete()" function of Question model and corrected a comment
Define the questionGroup position automatically
Merge remote-tracking branch 'origin/PouleRequestTesting' into dev
Deleted the old DB files and replaced them with a new one

The old files couldn't be imported due to a relation failing when
filling it. The new database with the structure and the data can be
imported without problems.
Merge remote-tracking branch 'origin/PouleRequestTesting' into dev
Deleted some useless code

This problem is now solved by getting the first free position available
TODO: make a function for that
Added the create a proposition feature

We can now create propositions for a question.
Merge remote-tracking branch 'origin/PouleRequestTesting' into dev

Conflicts:
	protected/controllers/PropositionsController.php
.gitignore fix?
Merge remote-tracking branch 'origin/PouleRequestTesting' into dev