fix time format to international time format

use the ISO 8601 standard
see http://en.wikipedia.org/wiki/ISO_8601#Times
Merge pull request #3032 from olivierverdier/dateformat

fix time format to international time format
remove xml from notebook magic docstrings

closes #3035
Merge pull request #3038 from minrk/noxml

remove xml from notebook magic docstrings
cast kernel cwd to bytes on Python 2 on Windows

Popen on Windows Python 2.x apparently cannot handle unicode cwd.
use filesystemencoding if defined, fallback on ascii.

closes #3039
Merge pull request #3046 from minrk/popen_cwdu_win32

cast kernel cwd to bytes on Python 2 on Windows

Popen on Windows Python 2.x apparently cannot handle unicode cwd. use
filesystemencoding if defined, fallback on ascii.

closes #3039
test double pyximport
Merge pull request #3062 from juliantaylor/double-pyximport-test

test double pyximport (#3007)