New HTML Pages and improved web pages

Update Includes:
Contact.html
About.html
Login.html
Register.html
BUT WAIT THERE'S MORE!
Updated files:
Artist.html
Calender.html
error.html
Favorieten.html
Festival.html
Upload.html

NEW IMAGES INCLUDED
* Profile pictures
* Favicon added
Merge branch 'master' of https://github.com/utwente-di/di17