Added 2 more tests
Added some documentation
Merge branch 'dev' into f/register
Added check if username already exists #33
Filter added
Merge branch 'dev' into f/register

Conflicts:
	Classes/PROJ/Services/AccountService.php
	tests/RegistrationTest.php
Fixed test
Added mock and fixed typos
Fixed xss, don't know why I did this. #51
Merge branch 'f/register' into f/register_style

Conflicts:
	Classes/PROJ/Controllers/AccountController.php
	Classes/PROJ/Services/AccountService.php
	tests/RegistrationTest.php
* Styled Register
* Now showing input after wrong submit
Merge branch 'f/register_style' into dev