[Cassandra Wiki] Update of "HowToContribute" by JonathanEllis

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The "HowToContribute" page has been changed by JonathanEllis:
http://wiki.apache.org/cassandra/HowToContribute?action=diff&rev1=38&rev2=39

Comment:
link "cassandra codebase" talk and ccm

-  1. Read the relevant parts of ArchitectureInternals
+  1. Read the relevant parts of ArchitectureInternals; watching http://www.channels.com/episodes/show/11765800/Getting-to-know-the-Cassandra-Codebase will probably also be useful
   1. Check if someone else has already begun work on the change you have in mind in the [[https://issues.apache.org/jira/browse/CASSANDRA|issue tracker]]
   1. If not, create a ticket describing the change you're proposing in the issue tracker
   1. Check out the latest version of the source code
@@ -11, +11 @@

    * Verify that you follow Cassandra's CodeStyle.
    * Verify that your change works by adding a unit test.
    * Make sure all tests pass by running "ant test" in the project directory.
+   * For testing multi-node behavior, https://github.com/pcmanus/ccm is useful
   1. When you're happy with the result create a patch:
    * svn add <any new file>
    * svn diff > branchname-issue.txt (e.g. trunk-123.txt, cassandra-0.6-123.txt)