tidy trailing slash everywhere & fix tests

core/middleware.py

@@ -36,6 +36,12 @@ class TroggleAppendSlashMiddleware(MiddlewareMixin):
     do NOT include 
     troggle.core.middleware.TroggleAppendSlashMiddleware
     in settings.py 
+    
+    FURTHER WARNING
+    If playing about with this, the 301 redirects that it creates will be cached INDEFINITELY by any browser you
+    used to test it, e.g. /css/main.css with be permanetly redirected to /css/main2.css/ with dreadful 
+    consequences, similarly for any images visited. You have to go into your browser settings and delete all cached
+    files to recover from this.
     """
 
     def process_request(self, request):