Issue #66 - Add lint tool and uncrustify config. Update contributing documentation on coding style.

CONTRIBUTING.md

@@ -40,7 +40,22 @@ someone else doesn't duplicate the work.
 
 ### Coding style
 
-- Use the 'hybrid' style described [here](https://gist.github.com/davidzchen/9188090). Get a `.editorconfig` for it [here](https://gist.github.com/ashleyh/9292108)
-- Don't abuse the pre-processor.
-- Don't mix platform-specific stuff into the main code.
-- TODO: commit messages?
+All code changes should follow the [Google C++ style guide](http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml)
+with the following exceptions:
+
+ * Function names should be `lower_case` separated by underscores.
+ * Struct and enum names that are not typedef-ed are `struct lower_case` and
+   `enum lower_case`.
+ * The opening brace for function declarations should appear on the next line.
+ * All control structures must always use braces.
+
+Please run `clint.py` to detect style errors. `clint.py` is Google's
+[`cpplint.py`](http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml#cpplint)
+script modified with the above style guidelines. It is not perfect and may
+have false positives and negatives, but is still a valuable tool. To have
+`clint.py` ignore certain special cases, put `// NOLINT` at the end of the
+line.
+
+### Commit messages
+
+TODO