Added admin controller.
Added upload form.
Added ACL-checks for uploading.
Added filter for exam uploads.
Moved ACL check for upload form.
Added form processing.
Added success processing.
Added auxiliary information to form upload form.
Added exam hydration.
Added exam mapper.
Added transactional block for exam persistance.
Added function to obtain upload location.
Added education data directory.
Finished file uploading.
Changed file naming scheme.
Merge pull request #28 from kokx/feature/admin-exams

Added exam uploading (only for administrators)