Added validation checks for Studygroup
Show messages if user submits form on invalid Studygroup
Changed all flash in user controll to use flash_message helper
all tests pass
Added tests for validations
Merge branch 'master' into fix_validation

Conflicts:
	app/controllers/studygroups_controller.rb
	app/models/global_constants.rb
	db/migrate/20141020011108_create_studygroups.rb
	db/schema.rb
changed default maximum
Merge branch 'master' into fix_validation
Merge pull request #30 from dkumar/fix_validation

Fix validation