add timeout option to Solr::Connection. Net::HTTP has a default of 30 seconds, but a large index requires much longer than that for an optimize, for example

git-svn-id: https://svn.apache.org/repos/asf/lucene/solr/trunk@510346 13f79535-47bb-0310-9956-ffa450edef68

client/ruby/solr-ruby/lib/solr/connection.rb

@@ -42,6 +42,8 @@ class Solr::Connection
   
     # Not actually opening the connection yet, just setting up the persistent connection.
     @connection = Net::HTTP.new(@url.host, @url.port)
+    
+    @connection.read_timeout = opts[:timeout] if opts[:timeout]
   end
 
   # add a document to the index. you can pass in either a hash