* forgot to add state_error class

lib/jam_ruby/errors/state_error.rb

@@ -0,0 +1,7 @@
+module JamRuby
+# this exception can be thrown if the server is not in a state that allows the operation to succeed
+# however, it's not necessarily a bad thing; it just means
+  class StateError < Exception
+
+  end
+end