Add hydra-dev-server which uses the classic Catalyst server

This, in turns allows

 - Using --restart for reloading the perl code
 - Printing traces on error

src/lib/Hydra/Script/DevServer.pm

@@ -0,0 +1,7 @@
+package Hydra::Script::DevServer;
+use Moose;
+use namespace::autoclean;
+
+extends 'Catalyst::Script::Server';
+
+1;