Fixes in directions.js and dalnav.js

Added missing semicolons in directions.js, moved the findDirections
function to dalnav.js, added deletion of coordinates to the deleteClass
method in dalnas.js.
Created the Tests for the New User Stories

Created the Tests for the new user story (Finding Directions to a
Class), and updated the older tests to incorporate the improvements we
made on the previous user stories (i.e. selecting a building from the
list).