Solr Core Replication functionality

Hi!

Conversation about Solr core replication started here:
http://code.google.com/p/solrnet/issues/detail?id=110

I'm not sure how to implement unit tests, so i used Solr server that is attached to the solution (..\SolrNet\solr\start.bat)

If you decide to pull, watch out for Solr Schema updates (SolrField.cs, SolrSchemaParser.cs, ...) which implements similar to: https://github.com/mausch/SolrNet/pull/125/files#diff-1

Ivan