DBTest createGroup.  not ended
fixed bugs in group and added create group method
Merge branch 'master' of https://github.com/DatoBula/unisys.git

Conflicts:
	src/main/java/ge/edu/sangu/unisys/db/SqlManager.java
	src/main/java/ge/edu/sangu/unisys/models/Group.java
	src/main/resources/META-INF/persistence.xml