Update .travis.yml
Minor change: removed old form validation
refactored teacher/proposals interface
Minor change: always displaying the links, if the user is not
authenticated it will be asked to login
Minor change: added a new column that represents the total number of
ECTS done by the student in the registration
Bug fix: the subclasses have to implement the method when they have
specific relations, to clear them
Merge pull request #595 from pedrorijo91/mscThesis

refactored teacher/proposals interface