README and minor felicities for script examples.

examples/README

@@ -1,5 +1,6 @@
-
-add_header.py   Simple script that just adds a header to every request.
-stub.py         Script stub with a method definition for every event. 
-stickycookies   An example of writing a custom proxy with libmproxy
+add_header.py           Simple script that just adds a header to every request.
+flowbasic               Basic use of mitmproxy as a library.
+stub.py                 Script stub with a method definition for every event. 
+stickycookies           An example of writing a custom proxy with libmproxy.
+upsidedownternet.py     Rewrites traffic to turn PNGs upside down.
 

examples/upsidedownternet.py

@@ -2,8 +2,7 @@ import Image, cStringIO
 def response(context, flow):
     if flow.response.headers["content-type"] == ["image/png"]:
         s = cStringIO.StringIO(flow.response.content)
-        img = Image.open(s)
-        img = img.rotate(180)
+        img = Image.open(s).rotate(180)
         s2 = cStringIO.StringIO()
         img.save(s2, "png")
         flow.response.content = s2.getvalue()