Ship docs in tarball and add build_sphinx information

Signed-off-by: Sebastian Ramacher <sramacher@debian.org>
Merge pull request #4 from sebastinas/docs

Ship docs in tarball and add build_sphinx information
Adapt to extension scheme changes in Flask >= 0.8

Signed-off-by: Sebastian Ramacher <sramacher@debian.org>
Merge pull request #6 from sebastinas/flask-0.8

Adapt to extension scheme changes in Flask >= 0.8
pass tests