Changing ExcelHelper to be generic, editig graduates to add
load_from_excel functionality
Merge branch 'master' of github.com:joniamir/college_seminar_bi
Addig supprot in loading and watching graduates and graduates_professions.
a lot of changes in excel layers for supproting.

Conflicts:
	app/controllers/student_controller.rb
Merge branch 'master' of github.com:joniamir/college_seminar_bi