Add privacy and terms of use links to footer.

Closes #24.
Merge branch 'issues/24-footer-links'
Change topnav items

Use http://tuderechoasaber.es/ items
Merge branch 'issues/13-topnav'
Add Terms of Use sign up confirmation
fixup! f9a63a4dc3451917bf25c4f87bafe1e0902a3bc0 terms message
fixup! 97d796a01d0c5994542939748c9f94a12c9d79f6 fix spec
fixup! f9a63a4dc3451917bf25c4f87bafe1e0902a3bc0 fix checkbox with errors style
Merge branch 'issues/9-terms-checkbox'
Add lib/models to loadpath
Add basic GeneralLaw
Add GeneralLaw#date_of_birth validation
Add GeneralLaw#age
Add User and GeneralLaw association
Accept nested attributes for GeneralLaw
Validate User / GeneralLaw association
Tidy a User#general_law spec
Use Factories in specs
Visit signin rather than signup to register

signup is the POST path
Fix typo in spec