Ignore byte compiled files

Signed-off-by: Michal Čihař <michal@cihar.com>
Rename the module to osc2

This way it can be installed together with existing osc. Also it will
prevent users of osc accidentally use osc2 with completely different
API.

Signed-off-by: Michal Čihař <michal@cihar.com>
- util.xpath, wc.package: pep8-ified code