Add better terminal support for invoke server command

tasks.py

@@ -256,4 +256,4 @@ def server(c, address="127.0.0.1:8000"):
     Note: This is *not* sufficient for a production installation.
     """
 
-    manage(c, "runserver {address}".format(address=address))
+    manage(c, "runserver {address}".format(address=address), pty=True)