Velocity: fix comment hash '#' escapes

Author: ochafik

src/main/java/com/nativelibs4java/velocity/Utils.java

@@ -31,7 +31,7 @@ protected static String processComments(String source, Function<String, String>
     protected static String quoteSharpsInComments(String source) {
         return processComments(source, new Function<String, String>() {
             public String apply(String f) {
-                return f.replaceAll("#", "\\\\#");
+                return f.replaceAll("(?<=\\w)#", "\\\\#");
             }
         });
     }