fixed issue 1607:NamedTemporaryFile broke GAE, thanks Alan

VERSION

@@ -1 +1 @@
-Version 2.6.0-development+timestamp.2013.07.26.03.03.00
+Version 2.6.0-development+timestamp.2013.07.26.15.55.14

gluon/main.py

@@ -172,7 +172,10 @@ def copystream_progress(request, chunk_size=10 ** 5):
         size = int(env.content_length)
     except ValueError:
         raise HTTP(400, "Invalid Content-Length header")
-    dest = tempfile.NamedTemporaryFile()
+    try: # Android requires this
+        dest = tempfile.NamedTemporaryFile()
+    except NotImplementedError: # and GAE this
+        dest = tempfile.TemporaryFile()
     if not 'X-Progress-ID' in request.vars:
         copystream(source, dest, size, chunk_size)
         return dest