hat can be used as a decorator for other functions that
require settings to be loaded. Functions with this decorator will be provided
with the configuration as its 'config' keyword argument.

.. versionchanged:: 1.3.0
   Omits the 'config' argument if the funcion we're decorating doesn't accept
   it.

::

  uses_settings = stem.util.conf.uses_settings('my_app', '/path/to/settings.cfg')

  @uses_settings
  def my_function(config):
    print 'hello %s!' % config.get('username', '')

:param str handle: hande for the configuration
:param str path: path where the configuration should be loaded from
:param bool lazy_load: loads the configuration file when the decorator is
  used if true, otherwise it's loaded right away

:returns: **function** that can be used as a decorator to provide the
  configuration

:raises: **IOError** if we fail to read the configuration file, if
  **lazy_load** is true then this arises when we use the decorator
Tc