Fix installation under pip 1.4 or later (need to specify pytz version)

Signed-off-by: Kwpolska <kwpolska@gmail.com>
Merge branch 'pytzfix' into samplesite-onefile
Changelog entry for 9b3b4a1948d90c44d426d03562e9eb73d055b714

Signed-off-by: Kwpolska <kwpolska@gmail.com>
Added .rst to the default reST extensions

via Issue #542.

Signed-off-by: Kwpolska <kwpolska@gmail.com>