* Update setup.py requires and classifiers
* Drop Python 2.7 and 3.4 from CI
* Update docs dropping 2.7 and 3.4 support
* Fix mock imports and remove tests related to pypi's mock module
* Add py27 and 34 support docs to the sidebar
* Remove usage of six from tmpdir
* Remove six.PY* code blocks
* Remove sys.version_info related code
* Cleanup compat
* Remove obsolete safe_str
* Remove obsolete __unicode__ methods
* Remove compat.PY35 and compat.PY36: not really needed anymore
* Remove unused UNICODE_TYPES
* Remove Jython specific code
* Remove some Python 2 references from docs
Related to #5275
Adds a badge showing the number of people helping this repo on CodeTriage.
[![Open Source Helpers](https://www.codetriage.com/pytest-dev/pytest/badges/users.svg)](https://www.codetriage.com/pytest-dev/pytest)
## What is CodeTriage?
CodeTriage is an Open Source app that is designed to make contributing to Open Source projects easier. It works by sending subscribers a few open issues in their inbox. If subscribers get busy, there is an algorithm that backs off issue load so they do not get overwhelmed
[Read more about the CodeTriage project](https://www.codetriage.com/what).
## Why am I getting this PR?
Your project was picked by the human, @schneems. They selected it from the projects submitted to https://www.codetriage.com and hand edited the PR. How did your project get added to [CodeTriage](https://www.codetriage.com/what)? Roughly 11 months ago, [cacoze](https://github.com/cacoze) added this project to CodeTriage in order to start contributing. Since then, 32 people have subscribed to help this repo.
## What does adding a badge accomplish?
Adding a badge invites people to help contribute to your project. It also lets developers know that others are invested in the longterm success and maintainability of the project.
You can see an example of a CodeTriage badge on these popular OSS READMEs:
- [![](https://www.codetriage.com/rails/rails/badges/users.svg)](https://www.codetriage.com/rails/rails) https://github.com/rails/rails
- [![](https://www.codetriage.com/crystal-lang/crystal/badges/users.svg)](https://www.codetriage.com/crystal-lang/crystal) https://github.com/crystal-lang/crystal
## Have a question or comment?
While I am a bot, this PR was manually reviewed and monitored by a human - @schneems. My job is writing commit messages and handling PR logistics.
If you have any questions, you can reply back to this PR and they will be answered by @schneems. If you do not want a badge right now, no worries, close the PR, you will not hear from me again.
Thanks for making your project Open Source! Any feedback is greatly appreciated.
* Changed "index" to be more similar to the README (#1708).
* Fixes numerous issues like missing documents, syntax errors, etc (#1829, #432).
* Mention all docs in "contents.rst" so it's easier for users to locate (#1112).
* Add doc generation and checking to Travis and AppVeyor, to avoid re-introducing errors.
Fixes#432, Fixes#1112, Fixes#1708, Fixes#1829