add watermark to template

[jGaboardi]

Following up with the watermark discussion, add an example here:

%watermark -u -n -t -z

@jGaboardi @knaaptime

pysal/pysal#1057 pysal/spaghetti#332

[jGaboardi]

%load_ext watermark
%watermark?

Docstring:
::

  %watermark [-a AUTHOR] [-d] [-n] [-t] [-i] [-z] [-u] [-c CUSTOM_TIME]
                 [-v] [-p PACKAGES] [-h] [-m] [-g] [-r] [-b] [-w] [-iv]

IPython magic function to print date/time stamps
and various system information.

optional arguments:
  -a AUTHOR, --author AUTHOR
                        prints author name
  -d, --date            prints current date as YYYY-mm-dd
  -n, --datename        prints date with abbrv. day and month names
  -t, --time            prints current time as HH-MM-SS
  -i, --iso8601         prints the combined date and time including the time
                        zone in the ISO 8601 standard with UTC offset
  -z, --timezone        appends the local time zone
  -u, --updated         appends a string "Last updated: "
  -c CUSTOM_TIME, --custom_time CUSTOM_TIME
                        prints a valid strftime() string
  -v, --python          prints Python and IPython version
  -p PACKAGES, --packages PACKAGES
                        prints versions of specified Python modules and
                        packages
  -h, --hostname        prints the host name
  -m, --machine         prints system and machine info
  -g, --githash         prints current Git commit hash
  -r, --gitrepo         prints current Git remote address
  -b, --gitbranch       prints current Git branch
  -w, --watermark       prints the current version of watermark
  -iv, --iversions      prints the name/version of all imported modules

[jGaboardi]

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