[Cassandra Wiki] Update of "HowToContribute" by EricEvans

[Apache Wiki <wi...@apache.org>]

Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Cassandra Wiki" for change notification.

The following page has been changed by EricEvans:
http://wiki.apache.org/cassandra/HowToContribute

The comment on the change is:
imported from confluence wiki

New page:
 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
  * svn checkout http://svn.apache.org/repos/asf/incubator/cassandra/trunk cassandra-trunk 
 1. Modify the source to include the improvement/bugfix
  * Verify that you follow Cassandra's formatting conventions (Use http://incubator.apache.org/cassandra/cassandra-eclipse-formatter.xml if you use Eclipse)
  * Verify that your change works by adding a unit test.
  * Make sure all tests pass by running "ant test" in the project directory. 
 1. When you're happy with the result create a patch:
  * svn add <any new file>
  * svn diff > CASSANDRA-issuenumber.patch 
 1. Attach the newly generated patch to the issue and click "Submit patch" in the left side of the JIRA page
 1. Wait for other developers or committers to review it and hopefully +1 the ticket
 1. Wait for a committer to commit it.