Added integration with nib

package.json

@@ -5,8 +5,9 @@
   "description": "stylus plugin for wintersmith",
   "license": "MIT",
   "dependencies": {
-    "stylus": ">= 0.0.1",
+    "stylus": ">=0.19.x",
+    "nib": ">=0.4.0",
     "async": ">= 0.0.1",
-    "coffee-script": "1.2.x"
+    "coffee-script": ">=1.2.x"
   }
 }

plugin.coffee

@@ -1,4 +1,5 @@
 stylus = require 'stylus'
+nib    = require 'nib'
 path = require 'path'
 async = require 'async'
 fs = require 'fs'
@@ -17,6 +18,7 @@ module.exports = (wintersmith, callback) ->
         stylus(@_text)
         .set('filename', this.getFilename())
         .set('paths', [path.dirname(path.join(@_base, @_filename))])
+        .use(nib())
         .render (err, css) ->
           if err
             callback err

test/contents/css/style.styl

@@ -0,0 +1,4 @@
+@import 'nib'
+
+body
+  box-shadow: 0 0 1px black

test/nib.coffee

@@ -0,0 +1,32 @@
+wintersmith  = require('wintersmith')
+wsStylus     = require('./../')
+
+describe "Nib integration", ->
+
+  beforeEach (done)->
+
+    # Install this plugin onto wintersmith
+    wsStylus wintersmith, ->
+
+      # Installed, now wintersmith can handle .styl
+      done()
+
+  it "should compile stylus with nib", (done)->
+
+    # Parse contents
+    wintersmith.ContentTree.fromDirectory 'test/contents/css', __dirname, (err, tree)->
+
+      # For style.styl, we want to make sure styl is compiling using nib
+      tree['style.styl'].render null, null, null, (err, content)->
+
+        if content?
+          content.should.equal("""
+          body {
+            -webkit-box-shadow: 0 0 1px #000;
+            -moz-box-shadow: 0 0 1px #000;
+            box-shadow: 0 0 1px #000;
+          }""")
+        # yay
+        done()
+
+