Reduce cost of including chaiscript.hpp

- ChaiScript no longer includes or automatically instantiates std lib
 - ChaiScript constructor now requires an std lib instance in the form
   of a ModulePtr object
 - This new layout facilitates better usage of compilation firewalls and
   factories for reducing the overall impact of ChaiScript on a project

include/chaiscript/dispatchkit/bootstrap_stl.hpp

@@ -17,6 +17,7 @@
 #define CHAISCRIPT_BOOTSTRAP_STL_HPP_
 
 #include "dispatchkit.hpp"
+#include "bootstrap.hpp"
 #include "register_function.hpp"
 
 namespace chaiscript