ignoring .pyc files
errors.py à la Ruby client/wallaby-classic

example usage:

  import errors
  from errors import fail

  fail(errors.make(errors.NOT_IMPLEMENTED), "This command is not implemented")
first pass at python arc utils
minor bugfix in Proxy#update
Improved proxied-attribute handling.
added errors.not_implemented
Added ConnectionMeta#fetch_json_resource
Improved arc_utils interface
improved node proxy