[Solr Wiki] Update of "HackingSolr" by HossMan

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The "HackingSolr" page has been changed by HossMan.
The comment on this change is: adding info on svn, and nightly builds.
http://wiki.apache.org/solr/HackingSolr?action=diff&rev1=5&rev2=6

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+ = Source Repository =
+ 
+ The Solr website contains [[http://lucene.apache.org/solr/version_control.html|Information about the Lucene/Solr Source Code SVN Repository]]
+ 
+ There are currently two active development branches: "branches/branch_3x/" with may become [[Solr3.1]] and "trunk" which will very likely become [[Solr4.0]].
+ 
+ = Nightly Builds =
+ 
+ Various Nightly builds are run on our [[http://hudson.zones.apache.org/hudson/view/Lucene/|Hudson Server]].  These nightly builds validate that the source code compiles and that the tests run successfully.  Using the "Last Successful Artifacts" link you can download binary builds of these development versions.  ('''NOTE: These are not official Apache Releases''')
+ 
  = Solr Plugins =
  
  The first thing to know if you are interested in hacking and customizing Solr, is that you may not need to customize the source at all.  Solr has a fairly extensive number of [[SolrPlugins|Plugin Hooks]] that allow you to add custom functionality for a variety of purposes by developing against some simple APIs, and then use your plugins by placing your jar in a special "lib" directory and refering to them by name in your configuration file.