Possible fix for error described in PR#1523

In reference to commit 5a8aec1 and [related disucssion](https://github.com/am11/WebEssentials2013/commit/5a8aec1015cf5eeb58481d39539d348b35c9a15d#commitcomment-7879628) I did a sample test case (outside of VS environment) and the error I received was `Unsupported previous source map format`, I did some tracing and noticed the following:

1. ~~postcss options, expect previous source map to be of type `string`.~~
2. ~~`result.map` returned by both rtlcss and autoprefixer are of type `object`.~~

**Update**: reverted in #1526

Moreover, in LESS compilation flow, rtlcss already recieved the prefixed css, and need not to call autoprefixer service again.




Can you send a PR for that? (remove undefined and auto-prefixer params from callers, change signature of rtlcss process function so auto-prefixer params go at the end and change the inner rtlcss caller accordingly) :)

Thanks!

Sent from my Windows Phone
________________________________
From: Mohammad Younes<mailto:notifications@github.com>
Sent: ‎9/‎23/‎2014 11:20
To: madskristensen/WebEssentials2013<mailto:WebEssentials2013@noreply.github.com>
Cc: Adeel Mujahid<mailto:adeelbm@outlook.com>
Subject: Re: [WebEssentials2013] Possible fix for error described in PR#1523 (#1525)

> @@ -120,8 +120,8 @@ var handleLess = function (writer, params) {
>                  if (params.rtlcss !== undefined) {
>                      var rtlResult = require("./srv-rtlcss").processRtlCSS(css,
>                                                                            map,
> -                                                                          params.autoprefixer,
> -                                                                          params.autoprefixerBrowsers,
> +                                                                          undefined,
> +                                                                          undefined,

I believe so, no need to autoprefix again

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