Merge branch 'ws-rspec' into ws-specs-db-modeling

Conflicts:
	app/models/position.rb
adding spec for area model
adding spec for level model
add specialization to position
adding specs for position  model
fixing position skill association
adding specs for position skill
updating README. How to run specs
Merge branch 'vs-new-db-modeling' into ws-specs-db-modeling

Conflicts:
	app/models/position_skill.rb
duplicated skill_id into schema
Merge pull request #29 from Bionexo/ws-specs-db-modeling

Ws specs db modeling