Better organization with "Integrations" section

Per https://github.com/sass/node-sass/pull/406#discussion-diff-16995707, also restored alphabetical order

README.md

@@ -153,7 +153,15 @@ console.log(stats);
 
 * In the case that both `file` and `data` options are set, node-sass will only attempt to honour the `file` directive.
 
-## Connect/Express middleware
+## Integrations
+
+Listing of community uses of node-sass in build tools and frameworks.
+
+### Brunch plugin
+
+[Brunch](http://brunch.io)'s official sass plugin uses node-sass by default, and automatically falls back to ruby if use of Compass is detected: <https://github.com/brunch/sass-brunch>
+
+### Connect/Express middleware
 
 Recompile `.scss` files automatically for connect and express based http servers
 
@@ -172,40 +180,36 @@ var server = connect.createServer(
 
 Heavily inspired by <https://github.com/LearnBoost/stylus>
 
-## DocPad Plugin
+### DocPad Plugin
 
 [@jking90](https://github.com/jking90) wrote a [DocPad](http://docpad.org/) plugin that compiles `.scss` files using node-sass: <https://github.com/jking90/docpad-plugin-nodesass>
 
-## Duo.js extension
+### Duo.js extension
 
 [@stephenway](https://github.com/stephenway) has created an extension that transpiles Sass to CSS using node-sass with [duo.js](http://duojs.org/)
-<https://github.com/duojs/sass>
+<https://github.com/stephenway/duo-sass>
 
-## Grunt extension
+### Grunt extension
 
 [@sindresorhus](https://github.com/sindresorhus/) has created a set of grunt tasks based on node-sass: <https://github.com/sindresorhus/grunt-sass>
 
-## Gulp extension
+### Gulp extension
 
 [@dlmanning](https://github.com/dlmanning/) has created a gulp sass plugin based on node-sass: <https://github.com/dlmanning/gulp-sass>
 
-## Brunch plugin
-
-[Brunch](http://brunch.io)'s official sass plugin uses node-sass by default, and automatically falls back to ruby if use of Compass is detected: <https://github.com/brunch/sass-brunch>
-
-## Harp
+### Harp
 
 [@sintaxi](https://github.com/sintaxi)’s Harp web server implicitly compiles `.scss` files using node-sass: <https://github.com/sintaxi/harp>
 
-## Metalsmith plugin
+### Metalsmith plugin
 
 [@stevenschobert](https://github.com/stevenschobert/) has created a metalsmith plugin based on node-sass: <https://github.com/stevenschobert/metalsmith-sass>
 
-## Meteor plugin
+### Meteor plugin
 
 [@fourseven](https://github.com/fourseven) has created a meteor plugin based on node-sass: <https://github.com/fourseven/meteor-scss>
 
-## Mimosa module
+### Mimosa module
 
 [@dbashford](https://github.com/dbashford) has created a Mimosa module for sass which includes node-sass: <https://github.com/dbashford/mimosa-sass>