Improve Hot Reload

Now, if you require styles for the second time of from another place, it will return the new styles and not those which you seen before first hot reload.

fix #32

src/index.js

@@ -27,22 +27,23 @@ module.exports.pitch = function pitch(remainingRequest) {
 
     module.exports = content.locals || {};
     module.exports._getCss = function() { return content.toString(); };
-    module.exports._insertCss = insertCss.bind(null, content);
+    module.exports._insertCss = function(options) { return insertCss(content, options) };
   `;
 
   output += this.debug ? `
-    var removeCss = function() {};
-
     // Hot Module Replacement
     // https://webpack.github.io/docs/hot-module-replacement
     // Only activated in browser context
     if (module.hot && typeof window !== 'undefined' && window.document) {
+      var removeCss = function() {};
       module.hot.accept(${stringifyRequest(this, `!!${remainingRequest}`)}, function() {
-        var newContent = require(${stringifyRequest(this, `!!${remainingRequest}`)});
-        if (typeof newContent === 'string') {
-          newContent = [[module.id, content, '']];
+        content = require(${stringifyRequest(this, `!!${remainingRequest}`)});
+
+        if (typeof content === 'string') {
+          content = [[module.id, content, '']];
         }
-        removeCss = insertCss(newContent, { replace: true });
+
+        removeCss = insertCss(content, { replace: true });
       });
       module.hot.dispose(function() { removeCss(); });
     }