fix failing get_page function

* if firstParams was None, PaginatedList was calling dict(None)
  which fails with a TypeError. If firstParams is None, just use
  an empty tuple, which dict() handles properly
Add a failing test for pull #133
Merge remote-tracking branch 'forks/llimllib/master'
Edit readme for #133
Update readme to list Notifico as a client of PyGithub (#128)
Reproduce issue #134
Fix indentation
Remove Python 3.1 from Travis build

/home/travis/build.sh: line 77: /home/travis/virtualenv/python3.1/bin/activate: No such file or directory
NamedUser.get_keys (Issue #130)
Doc for NamedUser.get_keys (Issue #130)
Add a test reproducing issue #131
Fix unit tests on Python <= 2.6
Dummy commit to test pubsubhubbub
First implementation of PubSubHubbub (un)subscription (Issue #129)

This will need 'some' refactoring.
Rename methods in Requester
Fix unit tests about logging
Refactor: put form/multipart encoding in Requester

And remove my fucking credentials from git! (Password changed, btw)
Remove useless Content-Length header
Refactor
Retrieve scopes for current oauth token from response headers (Issue #134)