[Lucene-hadoop Wiki] Update of "HowToContribute" by NigelDaley

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The following page has been changed by NigelDaley:
http://wiki.apache.org/lucene-hadoop/HowToContribute

The comment on the change is:
Added code review and automated patch testing verbage

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  === Contributing your work ===
  
- Finally, patches should be attached to a bug report in [http://issues.apache.org/jira/browse/HADOOP Jira].  If you are uncertain about the change, please first submit a draft version and ask others to review it.  When you believe that your patch is ready to be committed, select the "Submit Patch" link.  A committer should then evaluate it within a few days and either: commit it; or reject it with an explanation.
+ Finally, patches should be attached to a bug report in [http://issues.apache.org/jira/browse/HADOOP Jira] with a comment that asks for a code review following our [:CodeReviewChecklist: code review checklist].  When you believe that your patch is ready to be committed, select the "Submit Patch" link.  Submitted patches will be automatically tested against "trunk" and a success ("+1") message or failure ("-1") message will be automatically added to your bug report in Jira.
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+ Once a "+1" comment is received from the automated patch testing system and a "+1, code reviewed" comment is received from a code reviewer, a committer should then evaluate it within a few days and either: commit it; or reject it with an explanation.
  
  Please be patient.  Committers are busy people too.  If no one responds to your patch after a few days, please make friendly reminders.  Please incorporate other's suggestions into into your patch if you think they're reasonable.  Finally, remember that even a patch that is not committed is useful to the community.