refactoring database relations
removing unused tests
Merge branch '1.0' into ws-new-db-modeling

Conflicts:
	app/models/area.rb
	app/models/position.rb
	app/models/profile.rb
	app/models/skill.rb
	app/models/skill_level.rb
	app/models/specialization.rb
	db/schema.rb
Merge pull request #25 from Bionexo/ws-new-db-modeling

Ws new db modeling