Does not parse a string in the url function again. fix #29

Author: Horcrux7

src/com/inet/lib/less/LessParser.java

@@ -1063,7 +1063,7 @@ private Operation parseUrlParam() {
                     break;
                 case ')':
                     val = trim( builder );
-                    op.addOperand( new ValueExpression( reader, val ) );
+                    op.addOperand( new ValueExpression( reader, val, Expression.STRING ) );
                     return op;
                 default:
                     builder.append( ch );

src/com/inet/lib/less/ValueExpression.java

@@ -51,6 +51,18 @@ class ValueExpression extends Expression {
         super( obj, value );
     }
 
+    /**
+     * Create a new instance.
+     * @param obj another LessObject with parse position.
+     * @param value the value
+     * @param type the value type
+     */
+    ValueExpression( LessObject obj, String value, int type ) {
+        super( obj, value );
+        this.type = type;
+        this.unit = "";
+    }
+
     /**
      * Create a new value expression from a JavaScriptExpression.
      * @param expr another LessObject with parse position.

test/com/inet/lib/less/samples/general/anchorURL.css

@@ -0,0 +1,3 @@
+.blur {
+  filter: url(#wherearemyglasses);
+}

test/com/inet/lib/less/samples/general/anchorURL.less

@@ -0,0 +1 @@
+.blur { filter: url(#wherearemyglasses); }