[WIP] Default config.yaml in case a configuration file is missing in the default locations

MANIFEST.in

@@ -1,3 +1,4 @@
 recursive-include platypush/backend/http/webapp/dist *
 include platypush/plugins/http/webpage/mercury-parser.js
+include platypush/config/*.yaml
 global-include manifest.yaml

platypush/config/config.auto.yaml

@@ -0,0 +1,7 @@
+# Auto-generated configuration file.
+# Do not edit manually - use the config.yaml file for manual modifications
+# instead
+
+backend.http:
+  port: 8008
+  websocket_port: 8009

platypush/config/config.default.yaml

@@ -0,0 +1,2 @@
+include:
+  - config.auto.yaml