Validate all parameter types

 - We were previously only validating the types for query parameters
 - We now return proper validation errors for ALL parameters
Make title optional. Separate head title. Remove title from login page

 - Small change, but allows us to remove the redundant title from the
   main login/reg page which is duplicated with the labels on the
   tabs
Merge pull request #251 from gilt/remove-title-from-login-page

Remove title from login page