Merge branch 'contributing-guide' into develop

* contributing-guide:
  Change SDK to command line interface
  Add contributing guide

CONTRIBUTING.rst

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+Contributing
+============
+
+We work hard to provide a high-quality and useful command line interface, and
+we greatly value feedback and contributions from our community. Whether it's a
+new feature, correction, or additional documentation, we welcome your pull
+requests. Please submit any `issues <https://github.com/aws/aws-cli/issues>`__
+or `pull requests <https://github.com/aws/aws-cli/pulls>`__ through GitHub.
+
+This document contains guidelines for contributing code and filing issues.
+
+
+Contributing Code
+-----------------
+
+The list below are guidelines to use when submitting pull requests.
+These are the same set of guidelines that the core contributors use
+when submitting changes, and we ask the same of all community
+contributions as well:
+
+* The SDK is released under the
+  `Apache license <http://aws.amazon.com/apache2.0/>`__.
+  Any code you submit will be released under that license.
+* We maintain a high percentage of code coverage in our unit tests.  As
+  a general rule of thumb, code changes should not lower the overall
+  code coverage percentage for the project.  To help with this,
+  we use `coveralls <https://coveralls.io/r/boto/botocore>`__, which will
+  comment on changes in code coverage for every pull request.
+  In practice, this means that **every bug fix and feature addition should
+  include unit tests.**
+* Code should follow `pep 8 <https://www.python.org/dev/peps/pep-0008/>`__,
+  although if you are modifying an existing module, it is more important
+  for the code to be consistent if there are any discrepancies.
+* Code must work on ``python2.6``, ``python2.7``, and ``python3.3``,
+  ``python3.4`` and higher.
+* The AWS CLI is cross platform and code must work on at least linux, Windows,
+  and Mac OS X.  Avoid platform specific behavior.
+* If you would like to implement support for a significant feature that is not
+  yet available in the AWS CLI, please talk to us beforehand to avoid any duplication
+  of effort.  You can file an
+  `issue <https://github.com/aws/aws-cli/issues>`__
+  to discuss the feature request further.
+
+Reporting Issues
+----------------
+
+*  Check to see if there's an existing issue/pull request for the
+   bug/feature. All issues are at
+   https://github.com/aws/aws-cli/issues and pull reqs are at
+   https://github.com/aws/aws-cli/pulls.
+*  If there isn't an existing issue there, please file an issue. The
+   ideal report includes:
+
+   * A description of the problem/suggestion.
+   * The specific AWS CLI commands you are running.  Please include
+     debug logs for these commands by appending the ``--debug`` option
+     to each command.  Be sure to remove any sensitive information
+     from the debug logs.
+   * The AWS CLI version you are using ``aws --version``.
+
+The first thing an AWS CLI developer will do is try to reproduce the
+issue you are seeing, so try to reduce your issue to the smallest
+possible set of steps that demonstrate the issue.  This will lead
+to quicker resolution of your issue.