Made some refactoring
Added .htaccess file
- Refactored register.php
- Deleted admin_statistics.php
Deleted code_exec.php
- Added bootsrap
- Stylied register.php
- Moved main.css to css folder
- Stylied index.php
Added 404 page
Changed menu's styles
Removed unnecessary alert
Added Unssuccesful Register message

Not fully working
Refactored register.php
Added base classes for models
login page refactored
Fixed some issues
Merge conflicts
Deleted & moved some files
Changed information message in registration.php
Stylied the registration form
Minor
Added simple logo
Merge branch 'refactoring' of https://github.com/Daniel2015/IExam into refactoring

Conflicts:
	register.php
Merge branch 'refactoring' of github.com:Daniel2015/IExam into refactoring
Performed a merge of registration.php