Create meaningful JavaDocs instead of author names

extension-objects/src/main/java/units/CommanderUnit.java

@@ -4,7 +4,7 @@ import abstractextensions.UnitExtension;
 import concreteextensions.Commander;
 
 /**
- * Created by Srdjan on 27-Apr-17.
+ * Class defining CommanderUnit
  */
 public class CommanderUnit extends Unit {
 

extension-objects/src/main/java/units/SergeantUnit.java

@@ -4,7 +4,7 @@ import abstractextensions.UnitExtension;
 import concreteextensions.Sergeant;
 
 /**
- * Created by Srdjan on 27-Apr-17.
+ * Class defining SergeantUnit
  */
 public class SergeantUnit extends Unit {
 

extension-objects/src/main/java/units/SoldierUnit.java

@@ -4,7 +4,7 @@ import abstractextensions.UnitExtension;
 import concreteextensions.Soldier;
 
 /**
- * Created by Srdjan on 26-Apr-17.
+ * Class defining SoldierUnit
  */
 public class SoldierUnit extends Unit {
 

extension-objects/src/main/java/units/Unit.java

@@ -3,7 +3,7 @@ package units;
 import abstractextensions.UnitExtension;
 
 /**
- * Created by Srdjan on 26-Apr-17.
+ * Class defining Unit, other units will extend this class
  */
 public class Unit {