Fixes #96. Fix support for Alphasort option for LESS/SCSS properties

examples/simple-jsbeautifyrc/alphasort1.scss

@@ -0,0 +1,4 @@
+.example(){
+   .base-apple(); // Sets base apple color to red
+   .apple-color(@color-green); // Sets apple color to green
+}

lib/langs/less-beautify.coffee

@@ -7,6 +7,7 @@ module.exports = (text, options, callback) ->
     mode: "beautify"
     inchar: options.indent_character
     insize: options.indent_size
+    alphasort: options.alphasort || false
 
   output = prettydiff.api(args)
   result = output[0]