issue #74 - configured topology name as symbol breaks topology submission

lib/red_storm/simple_topology.rb

@@ -135,7 +135,7 @@ module RedStorm
     end
 
     def self.configure(name = nil, &configure_block)
-      @topology_name = name if name
+      @topology_name = name.to_s if name
       @configure_block = configure_block if block_given?
     end
 

spec/red_storm/simple_topology_spec.rb

@@ -180,6 +180,11 @@ describe RedStorm::SimpleTopology do
           configure "name"
         end
         Topology1.topology_name.should == "name"
+
+        class Topology2 < RedStorm::SimpleTopology
+          configure :symbolname
+        end
+        Topology2.topology_name.should == "symbolname"
       end
 
       it "should parse configuration block only" do