MoobotFactoids: Fix tests with fastest computers.
src/test.py: Implement assertIs for old Python versions.
src/test.py: Implement assertIn for old Python versions.
core: Fix issue with Python 2.6 (cStringIO is buggy).
travis.yml: Fix Python 3 build.
Fix 2to3 fixers to work with Python 3.
Fix 2to3 fixers to work with Python 3.
Merge branch 'py3k-backport' into testing
Copy docs to py3k/ too.
Merge branch 'py3k-backport' into testing

Conflicts:
	sandbox/run_2to3.sh
Google: Fix encoding with Python 3.
Merge branch 'py3k-backport' into testing
Filter: Fix encoding with Python 3.
Internet: Fix Python 3 compatibility.
Web: Fix Python 3 compatibility.
supybot-test: Add the --exclude option.
travis.yml: Exclude PluginDownloader from being tested (Github API limit rate...).
travis.yml: Add Pypy to the list of Python versions.
Dict: Fix encoding.
core: Prevent infinite recursion with Pypy.