Extend log patterns

[The-Compiler]

There are actually a few unrelated changes in here, but I hope you don't mind (at least they have their own commits 😉).

• Fix test_logging_fails_ignore_mark.
• Add extend keyword argument to qt_log_ignore mark.
• Validate qt_log_ignore keyword arguments.
• Remove unneeded imports.
• Add .cache and .venv to .gitignore.

[nicoddemus]

I don't mind at all, thanks for the PR Florian! 😄

I'm investigating the errors on py27 on Windows.

[The-Compiler]

The ones on Linux are because coverage 4.0 doesn't support Python 3.2 anymore - maybe it's time to drop 3.2 support too?

[nicoddemus]

Yeah, the only problem is that Qt4 is available on 3.2 only on the Ubuntu version supported by Travis... I have to find some time and investigate how to get around that. 😑

[The-Compiler]

Oh, right, reminds me of #96 - one possibility would probably be to use tox on Travis too, with the link_pyqt script. I hope I get time to take a look later today.

[nicoddemus]

The failures on Windows are not related to this change... I will have to fix that on pytest itself.

[nicoddemus]

Opened pytest-dev/pytest#1133 to discuss how to properly solve this.