merge
checkForDuplicate

Checking user duplicates
Merge branch 'devel' of https://github.com/spjass/Brojekti into spjass-devel

Conflicts:
	application/src/LoginScreen.java
	application/src/RegisterScreen.java
Merge branch 'spjass-devel' into devel

Conflicts:
	application/src/Main.class
	application/src/test/PostPHP.java