Update documentation on pyqt4v2

[montefra]

I have a tentative update of the documentation according to what we have discussed in #148.

I'm not very satisfied by it. I might change some of it in the next days. Comments are welcome

[coveralls]

Coverage remained the same at 100.0% when pulling c25e7c0 on montefra:fix_pyqt4v2 into e5f4467 on pytest-dev:master.

[nicoddemus]

Probably this is too much information to be into the "introduction" part of the docs. Perhaps we can add an entry "A note about pyqt4v2", similar to A note about QApplication.exit() and add a link here?

[nicoddemus]

Thanks for the follow up @montefra!

[montefra]

@nicoddemus I've updated the info according to your suggestions.

---

on a slightly related note: would you mind if I add extras_require={'doc': ['sphinx', 'sphinx_rtd_theme']}, in the setup call and update the Development information to use pip install -e . or pip install -e .[doc] , instead of python setup.py develop?
I found myself using a couple of different venvs and having to run make html, pip install sphinx, make html and then pip install sphinx_rtd_theme to be able to build the documentation locally.

[coveralls]

Coverage remained the same at 100.0% when pulling d2a461b on montefra:fix_pyqt4v2 into e5f4467 on pytest-dev:master.

[nicoddemus]

on a slightly related note: would you mind if I add extras_require={'doc': ['sphinx', 'sphinx_rtd_theme']}, in the setup call and update the Development information to use pip install -e . or pip install -e .[doc] , instead of python setup.py develop?

Not at all, seems like a much better approach than the current one. 😁

[montefra]

can I do it here or would you prefer a new branch?

[nicoddemus]

Feel free to do it here, just make sure to use a separate commit. 👍

[coveralls]

Coverage decreased (-2.0%) to 98.049% when pulling 23f6bc3 on montefra:fix_pyqt4v2 into e5f4467 on pytest-dev:master.

[coveralls]

Coverage remained the same at 100.0% when pulling 23f6bc3 on montefra:fix_pyqt4v2 into e5f4467 on pytest-dev:master.

[nicoddemus]

Excellent, many thanks @montefra!

[montefra]

Glad to contribute back to a tool I use regularly.
Thank you for accepting the PR.