* List all of the main ways in which people can contribute
* Provide helpful links for each of those ways
* Explain how to contribute code
* Provide helpful links to source code, how to send patches, reporting
bugs, etc.
* Improve wording and formatting in general
* Distinguish security issues from bugs and add link to information
on reporting security issues
* Add link to Mailing Lists page in place of direct link to Google
Groups web interface
* Add common redirects
