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
Channel: Add pattern matching to @ban list.
Channel: Document last commit in the help string of @ban list.
Time.tztime: Don't display microseconds

There's no reason for displaying them under most circumstances that I
can think of.
Unix: Longer timeout so tests stop failing that often.
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
Merge pull request #915 from nyuszika7h/tztime-remove-μs

Time.tztime: Don't display microseconds
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
Misc: give better help when command isn't found but coincides with the name of a loaded plugin (ref #912)
Network: don't allow '.' in network names (Closes #874)

Network: fix typo
Merge pull request #919 from GLolol/network/no-dots-in-netname

Network: don't allow '.' in network names (Closes #874)
Merge pull request #920 from GLolol/misc/better-help

Misc: give better help when command isn't found but coincides w/ the name of a loaded plugin