[Tajo Wiki] Update of "HowToContribute" by ChrisMattmann

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The "HowToContribute" page has been changed by ChrisMattmann:
http://wiki.apache.org/tajo/HowToContribute?action=diff&rev1=3&rev2=4

Comment:
- add Chris's idea for patch naming.

   * update documentation (e.g., package.html files, this wiki, etc.)
  
  === Naming your patch ===
+ 
+ A suggested patch naming scheme is below:
+ 
+ * <JIRA issue ID #>.<last name>.<yyMMdd>.<n>.patch.txt
+ 
+   Example for TAJO
+ 
+ TAJO-578.Mattmann.032803.patch.txt
+ 
+ This:
+ 
+ # helps identifier the contributor in the actual patch file by their last
+ name (alternative, first letter of first name, and last name or some other
+ alternative
+ may be used).
+ 
+ # indicates the date on which the patch was submitted in the file name
+ # allows for multiple revisions (n parameter) if multiple patches in the
+ same day
+ # Adds a .txt at the end, b/c some browsers, and HTTPD servers, don't
+ understand that the .patch file extension is actually a text file and thus downloads
+ instead of displaying the file in JIRA.
+ 
+ Another alternative for patch naming is shown below:
+ 
   * If the Jira issue number is TAJO-7777, patches for the master branch should be named: TAJO-7777.patch.
   * If the branch is 'branch_0_3' and the issue number is TAJO-7777, patches for a non-master branch should be named: TAJO-7777-branch_0_3.patch