ignore double escape characters. fix #82

Author: Horcrux7

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

@@ -204,7 +204,7 @@ int nextBlockMarker() throws LessException {
                             if( ch == ch2 && !isSlash ) {
                                 break;
                             }
-                            isSlash = ch2 == '\\';
+                            isSlash = ch2 == '\\' && !isSlash;
                         }
                         break;
                     case '\\':

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

@@ -1092,7 +1092,7 @@ private void readQuote( char quote, StringBuilder builder ) {
             if( ch == quote && !isBackslash ) {
                 return;
             }
-            isBackslash = ch == '\\';
+            isBackslash = ch == '\\' && !isBackslash;
         }
     }
 

test/com/inet/lib/less/samples/less_org_tests/less/strings.css

@@ -1,4 +1,6 @@
 #strings {
+  doubleEscape: "\\";
+  doubleEscapeVar: "\\";
   background-image: url("http://son-of-a-banana.com");
   quotes: "~" "~";
   content: "#*%:&^,)!.(~*})";

test/com/inet/lib/less/samples/less_org_tests/less/strings.less

@@ -1,4 +1,7 @@
+@doubleEscape: "\\";
 #strings {
+  doubleEscape: "\\";
+  doubleEscapeVar: @doubleEscape;
   background-image: url("http://son-of-a-banana.com");
   quotes: "~" "~";
   content: "#*%:&^,)!.(~*})";