Added validation for operators and non raw column names

Author: JanHolger

src/main/java/org/javawebstack/orm/query/QueryColumn.java

@@ -9,7 +9,7 @@
 
 public class QueryColumn {
 
-    private static final Pattern NAME_PATTERN = Pattern.compile("[A-Za-z0-9_-]+");
+    private static final Pattern NAME_PATTERN = Pattern.compile("[A-Za-z0-9_\\-.]+");
 
     private final String name;
     private final boolean raw;