Update Thrift bindings for 5.1 (#295)

* Update mapd.thrift bindings

* Clean up contributing page

docs/source/contributing.rst

@@ -127,28 +127,10 @@ When the upstream `mapd-core`_ project updates its Apache Thrift definition file
  thrift -gen py completion_hints.thrift
  thrift -gen py common.thrift
  thrift -gen py serialized_result_set.thrift
+ thrift -gen py extension_functions.thrift
 
 After the bindings are generated, copy them to their respective folders in the pymapd repo. Each set of Thrift files
-are their own package within the overall pymapd package. Also, take note to remove unneeded imports as shown in this `commit`_, as the unneeded imports
-can be problematic, especially when calling pymapd from other languages (specifically, R).
-
---------------------------
-Updating the Documentation
---------------------------
-
-The documentation for pymapd is generated by ReadTheDocs on each commit. Some pages (such as this one) are manually created,
-others such as the API Reference is generated by the docstrings from each method.
-
-If you are planning on making non-trival changes to the documentation and want to preview the result before making a commit,
-you need to install sphinx and sphinx-rtd-theme into your development environment:
-
-.. code-block:: shell
-
- pip install sphinx sphinx-rtd-theme
-
-Once you have sphinx installed, to build the documentation switch to the ``pymapd/docs`` directory and run ``make html``. This will update the documentation
-in the ``pymapd/docs/build/html`` directory. From that directory, running ``python -m http.server`` will allow you to preview the site on ``localhost:8000``
-in the browser. Run ``make html`` each time you save a file to see the file changes in the documentation.
+are their own package within the overall pymapd package.
 
 --------------------------
 Updating the Documentation