add html minifier middleware (thanks aaronbassett)

compress/middleware.py

+from django.utils.encoding import DjangoUnicodeDecodeError
+from django.utils.html import strip_spaces_between_tags as minify_html
+
+
+class MinifyHTMLMiddleware(object):
+    def process_response(self, request, response):
+        if 'text/html' in response['Content-Type']:
+            try:
+                response.content = minify_html(response.content.strip())
+            except DjangoUnicodeDecodeError:
+                pass
+        return response

docs/usage.rst

@@ -53,3 +53,17 @@ with the name “scripts”, you would use the following code to output them all
    {% compressed_css 'screen' %}
    {% compressed_css 'print' %}
    {% compressed_js 'scripts' %}
+
+
+Middleware
+==========
+
+To enable HTML compression add ``compress.middleware.MinifyHTMLMiddleware``, 
+to your ``MIDDLEWARE_CLASSES`` settings.
+
+Ensure that it comes after any middleware which modify your HTML, like ``GZipMiddleware`` ::
+
+   MIDDLEWARE_CLASSES = (
+    'django.middleware.gzip.GZipMiddleware',
+    'compress.middleware.MinifyHTMLMiddleware',
+   )