Merge pull request #124 from fourseven/master

Add in comments for the rebuild.js file, and include support to auto-rebuild on linux as well.

rebuild.js

 var spawn = require('child_process').spawn;
 
-if (process.platform === 'darwin') {
+// Only rebuild the binaries if on Mac OS or Linux, as we're assuming that
+// the toolchain exists. This is here to not rebuild on windows, as that
+// had issues as of https://github.com/andrew/node-sass/issues/123
+if (process.platform === 'darwin' || process.platform === 'linux') {
   spawn('node-gyp', ['rebuild']);
 }