Log in and registration in one page
Different menu when logged in
Session requested in main.scala.html
Fixed findbugs warning
Merge pull request #13 from florisverburg/feature_loggedin_design

Feature loggedin design
Adjusted the practical to have a secret, also adjusted the test
made a basic secret registration for a practical
Fixed the viewing of a practical, secret doesn't work yet
Fixed a bug in the authentication method
Finished the basic version of practicalcontroller
Fixed the initial and test data, how it is loaded and the displaying of this
mend
Fixed some checkstyle errors
Added tests for the practicalcontroller