[Solr Wiki] Update of "SolrPlugins" by HossMan

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The following page has been changed by HossMan:
http://wiki.apache.org/solr/SolrPlugins

New page:
= Solr Plugins =

/!\ :TODO: /!\ write short summary of why people might want to load custom code, and the loose definition of a "Solr Plugin"

[[TableOfContents]]

== How to Load Plugins ==

At the moment, loading custom code into Solr is only easy in Resin. the mechanism for doing so can be found on the SolrResin configuration page.

A more general purpose mechanism is currently being investigated, but in the meantime the only method that works consistently on any servlet container is to:
   1. unpack the solr.war
   1. add a jar containing your custom classes to the `WEB-INF/lib` directory
   1. repack your new, customized, solr.war and use it.

== List of Classes that are 'Pluggable' ==

/!\ :TODO: /!\ for each class, link to javadocs and show example of where/how to configure usage

=== SolrRequestHandler ===
=== QueryResponseWriter ===
=== Similarity ===
=== Analyzer ===
=== TokenizerFactory ===
=== TokenFilterFactory ===
=== CacheRegenerator ===
=== FieldType ===
=== SolrCache ===
=== SolrEventListener ===
=== UpdateHandler ===