Add rspec + factory girl
added first spec for volunteer
add factory for volunteer
now the factory actually work
add validation that first name is not empty
add validation that last name is not empty
changed volunteers_id to volunteer_id in volunteer_availabilities
added shoulda + nulldb for test
now controller throw exception when not valid + change create to new because parent is not saved it
added validation for volunteer_availabilities in volunteer + testing it + factory + refactor in testing to shoulda