fix context: include traceback in case of general catched exception (Issue #58)

hapic/context.py

                     # TODO BS 2018-05-04: How to be attentive to hierarchy ?
                     if isinstance(exc, handled_exception.exception_class):
                         error_builder = self.get_default_error_builder()
-                        error_body = error_builder.build_from_exception(exc)
+                        error_body = error_builder.build_from_exception(
+                            exc,
+                            include_traceback=self.is_debug(),
+                        )
                         return self.get_response(
                             json.dumps(error_body),
                             handled_exception.http_code,

hapic/ext/pyramid/context.py

             def view_func(exc, request):
                 # TODO BS 2018-05-04: How to be attentive to hierarchy ?
                 error_builder = self.get_default_error_builder()
-                error_body = error_builder.build_from_exception(exc)
+                error_body = error_builder.build_from_exception(
+                    exc,
+                    include_traceback=self.is_debug(),
+                )
                 return self.get_response(
                     json.dumps(error_body),
                     http_code