update symlinks for contributing

Signed-off-by: Ross Z Bernet <rbernet@azavea.com>

CONTRIBUTING.rst

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+Contributing
+============
+
+We value all kinds of contributions from the community, not just actual
+code. Perhaps the easiest and yet one of the most valuable ways of
+helping us improve GeoTrellis is to ask questions, voice concerns or
+propose improvements on the `Mailing
+List <https://locationtech.org/mailman/listinfo/geotrellis-user>`__.
+
+If you do like to contribute actual code in the form of bug fixes, new
+features or other patches this page gives you more info on how to do it.
+
+Building GeoTrellis
+-------------------
+
+1. Install SBT (the master branch is currently built with SBT 0.13.12).
+2. Check out this repository.
+3. Pick the branch corresponding to the version you are targeting
+4. Run ``sbt test`` to compile the suite and run all tests.
+
+Style Guide
+-----------
+
+We try to follow the `Scala Style
+Guide <(http://docs.scala-lang.org/style/)>`__ as closely as possible,
+although you will see some variations throughout the codebase. When in
+doubt, follow that guide.
+
+Git Branching Model
+-------------------
+
+The GeoTrellis team follows the standard practice of using the
+``master`` branch as main integration branch.
+
+Git Commit Messages
+-------------------
+
+We follow the 'imperative present tense' style for commit messages.
+(e.g. "Add new EnterpriseWidgetLoader instance")
+
+Issue Tracking
+--------------
+
+If you find a bug and would like to report it please go there and create
+an issue. As always, if you need some help join us on
+`Gitter <https://gitter.im/locationtech/geotrellis>`__ to chat with a
+developer.
+
+Pull Requests
+-------------
+
+If you'd like to submit a code contribution please fork GeoTrellis and
+send us pull request against the ``master`` branch. Like any other open
+source project, we might ask you to go through some iterations of
+discussion and refinement before merging.
+
+As part of the Eclipse IP Due Diligence process, you'll need to do some
+extra work to contribute. This is part of the requirement for Eclipse
+Foundation projects (`see this page in the Eclipse
+wiki <https://wiki.eclipse.org/Development_Resources/Handling_Git_Contributions#Git>`__
+You'll need to sign up for an Eclipse account **with the same email you
+commit to github with**. See the ``Eclipse Contributor Agreement`` text
+below. Also, you'll need to signoff on your commits, using the
+``git commit -s`` flag. See
+https://help.github.com/articles/signing-tags-using-gpg/ for more info.
+
+Eclipse Contributor Agreement (ECA)
+-----------------------------------
+
+Contributions to the project, no matter what kind, are always very
+welcome. Everyone who contributes code to GeoTrellis will be asked to
+sign the Eclipse Contributor Agreement. You can electronically sign the
+`Eclipse Contributor Agreement
+here <https://www.eclipse.org/legal/ECA.php>`__.
+
+Editing these Docs
+------------------
+
+Contributions to these docs are welcome as well. To build them on your own
+machine, ensure that ``sphinx`` and ``make`` are installed.
+
+Installing Dependencies
+^^^^^^^^^^^^^^^^^^^^^^^
+
+Ubuntu 16.04
+''''''''''''
+
+.. code:: console
+
+   > sudo apt-get install python-sphinx python-sphinx-rtd-theme
+
+Arch Linux
+''''''''''
+
+.. code:: console
+
+   > sudo pacman -S python-sphinx python-sphinx_rtd_theme
+
+MacOS
+'''''
+
+``brew`` doesn't supply the sphinx binaries, so use ``pip`` here.
+
+Pip
+'''
+
+.. code:: console
+
+   > pip install sphinx sphinx_rtd_theme
+
+Building the Docs
+^^^^^^^^^^^^^^^^^
+
+Assuming you've cloned the `GeoTrellis repo
+<https://github.com/locationtech/geotrellis>`__, you can now build the docs
+yourself. Steps:
+
+1. Navigate to the ``docs/`` directory
+2. Run ``make html``
+3. View the docs in your browser by opening ``_build/html/index.html``
+
+.. note:: Changes you make will not be automatically applied; you will have
+          to rebuild the docs yourself. Luckily the docs build in about a second.
+
+File Structure
+^^^^^^^^^^^^^^
+
+When adding or editing documentation, keep in mind the following file
+structure:
+
+-  ``docs/tutorials/`` contains simple beginner tutorials with concrete
+   goals
+-  ``docs/guide/`` contains detailed explanations of GeoTrellis concepts
+-  ``docs/architecture`` contains in-depth discussion on GeoTrellis
+   implementation details

docs/contributing.rst

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+CONTRIBUTING.rst