Post conversion

* Some @import orders have been switched to don't broke Stylus parsing
* Some .mixin have been rename to .mixin() for a better conversion

Conversion

First of all, I've created a base script which made most of the conversion
``shell
node less2stylus.js
`

This convert every .less to .styl equivalent
_Please note this less to stylus conversion script make a simple but easier to read syntax
Stylus do not require this but this script keep the braces, the semicolons & a variable identifier ($ instead of @ a la Sass)_
Since less just have simple mixin, Stylus have @extend Sass feature, so I've optimized some mixin call without args by replacing them with @extend. The stylus output will probably be lighter than the less one

After conversion: stylus parse try

Fixes of "parse error": I've change just some tiny stuffs. Mainly;
* url(data...) to url(unquote('data...'))
* same for microsoft filters

Manual Output comparison

`shell
stylus --out _output index.styl

lessc index.less > _output/index.less.css
`

Since I've used @extend with less2stylus(), I can do a simple comparison. So I modified a little bit the less code to be able to try comparision without @extend (it was hard since less has same syntax for class & mixins).

Comparison results

Things that are not a problem

By default, stylus does not include / */ comments so there some differences but really not important
* The opacity() mixin is completly broken but it's not really a problem. It's just less than 10 lines. & Stylus nib extension have that https://github.com/visionmedia/nib/blob/master/lib/nib/vendor.styl#L240
* Some url('') have been changed to url(""), it's not a problem.
* Some color value have been optimized (e.g. : black to #000) or lowercased

Main issue

Becareful, there is a sort of major with if a less mixin, which are also class name.
So for some mixin called without args, you have to add the class name after the mixin declaration.

`styl
mixin() { // previously .mixin used as a mixin
//...
}

.mixin {
mixin()
}

``

Only tiny issue

Same Color functions return differents results
e.g. :

* less lighten(#E0E3E4, 5%) => #eeeff0
* stylus lighten(#E0E3E4, 5%) => #e2e4e5
* sass lighten(#E0E3E4, 5%) => #eeeff0

The difference is no easily visible, but anyway, I've bumped this issue https://github.com/LearnBoost/stylus/issues/328
Compare the difference http://0to255.com/eeeff0 vs http://0to255.com/e2e4e5