Dump config file

Add functionality to dump config file when calling a ConfigCommand

Fixes #61 (closed)

bob/extension/scripts/main_cli.py

@@ -3,7 +3,7 @@
 import pkg_resources
 import click
 from click_plugins import with_plugins
-from .click_helper import AliasedGroup, ConfigCommand
+from .click_helper import AliasedGroup
 from ..log import setup
 logger = setup('bob')