Selene

- fixed [225](https://github.com/yashaka/selene/issues/225): Failed to get last_screenshot from shared browser if element with custom config failed

- broken release:)

- fixed type hints in `*.should(here)`
- latest PyCharm 2020.2 revealed the hidden issue with typing

- fixed `selene.support.shared.browser.with_`
- to return sharedbrowser instance instead of browser instance
- made `browser.config.hold_browser_open` to influence browser quit logic
- even if set after calling `browser.open` or resetting `browser.config.driver`

- fixed shared browser automatic quit on process exit
- that led to session error
in case you quit shared browser manually in your fixture

- added support of xpath to start with `(` in `s(selector)`, etc.
- example: `ss('(//h1|//h2)[contains(text(), "foo")]').should(have.size(10))`