Login and logout implemented.

-[x] View\Home : Added 2 methods.
-[x] Control\Home : Added some case on the siwtch(controllerAction)  
-[x] Foundation\User : Modified getByUsername(); now it returns false
if it doesn't find any user.
-[x]Foundation\DegreeCourse.php : Modified getByName(); now it
returns false if it doesn't find any degreeCourse.
Merge branch 'master' of https://github.com/davcri/Unibox