Use newer form of catching exceptions

autopep8 -i --select=W602
Also some other minor deprecated syntax changes, like "while 1".
I did not commit the less obvious changes.

modules/aum/optim/visibility.py

@@ -47,6 +47,6 @@ class Visibility(Optimization):
         try:
             with self.browser:
                 self.browser.login()
-        except BrowserUnavailable, e:
+        except BrowserUnavailable as e:
             print str(e)
             pass