Remove source field from Error model

Author: Pawel Szymanski

api/src/main/java/com/creatubbles/api/exception/Error.java

@@ -5,7 +5,6 @@
  */
 public class Error {
     String code;
-    String source;
     String title;
     String detail;
 
@@ -17,14 +16,6 @@ public void setCode(String code) {
         this.code = code;
     }
 
-    public String getSource() {
-        return source;
-    }
-
-    public void setSource(String source) {
-        this.source = source;
-    }
-
     public String getTitle() {
         return title;
     }