Google: Set default value of maximumResults to 3

3 results usually fit in a single message, on the other hand the default
of 8 is too much.
Owner: don't allow reloading the Owner plugin
Time.time: Work around a Python bug

There is a bug [1] in older versions of Python (reproduced up to 2.7.5
and 3.2.3) where time.strftime('%z') would always give '+0000' if it's
given an argument. It's closed as "not a bug", but appears to be fixed
in recent versions. To work around this, datetime and dateutil is used
now when available.

[1] http://bugs.python.org/issue1493676
Math/README.md: fix a silly typo
Merge pull request #918 from GLolol/patch-1

Math/README.md: fix a silly typo
Merge pull request #884 from nyuszika7h/google-max-results

Google: Set default value of maximumResults to 3
Merge pull request #895 from GLolol/no-reload-owner

Owner: don't allow reloading the Owner plugin
Merge pull request #914 from nyuszika7h/time-workaround-python-bug

Time.time: Work around a Python bug