Contributing

With issues:
- Use the search tool before opening a new issue.
- Please provide source code and commit sha if you found a bug.
- Review existing issues and provide feedback or react to them.
With pull requests:
- Open your pull request against master
- Your pull request should have no more than two commits, if not you should squash them.
- It should pass all tests in the available continuous integration systems such as TravisCI.
- You should add/modify tests to cover your proposed code changes.
- If your pull request contains a new feature, please document it on the README.

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