[Lucene-java Wiki] Update of "HowToContribute" by MikeMcCandless

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

The comment on the change is:
Add back-compat test as well

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  In case your contribution fixes a bug, try and make your test case fail to show the presence of the bug. A test case showing the presence of a bug is also a good contribution by itself.
  
- Once your test case passes, please make sure that all unit tests succeed before constructing your patch.
+ Once your test case passes, please make sure that all unit tests (core, contrib, and back-compatibility) succeed before constructing your patch, by running this:
  
  {{{
  > cd lucene-trunk
- > ant clean test
+ > ant clean test test-tag
  }}}
  After a while, if you see
  {{{