Improve zetuptoolz' logging of what it is doing.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
Bump zetuptoolz version number.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
Rename zetuptoolz egg to reflect new version number.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
Refactoring to move the not_import_versionable and ignorable package lists to _auto_deps.py.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
Make dependencies different for Windows and non-Windows.
Also move require_more() to top-level. fixes #2249

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
Accept pyOpenSSL >= 0.14 as a dependency iff it is already installed.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
_auto_deps.py cosmetics and cleanup.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
.travis.yml: remove workaround to install Twisted 13.0 which should no longer be needed.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>