Fix too long line in soc.cache.logic module. Patch by: Pawel Solyga Reviewed by: to-be-reviewed

Add missing responses import and replace usage of helper.responses with just responses in soc.views.models.student module. Patch by: Pawel Solyga Reviewed by: to-be-reviewed

Fix too long line and redefining variable 'review' from outer scope in soc.views.models.student_proposal module. Patch by: Pawel Solyga Reviewed by: to-be-reviewed