refactored ftpSettings to use file objects for loading and saving the
configuration instead of storing the path to the configuration file, and
moved functionality for reloading the server configuration to a helper
function
=====
- refactored ftpSettings constructor and ftpSettings.load() and renamed
  ftpSettings.apply() to ftpSettings.write() - updated these functions to
  use file objects for loading and saving the xml configuration file
  (pyFileZilla/ftpSettings.py)
- added filezilla_reload_config() helper function to execute the command
  to reload the server configuration file (pyFileZilla/ftpSettings.py)
- added filezilla_reload_config() to the pyFileZilla package includes
  (pyFileZilla/__init__.py)
- updated unit tests for the refactored ftpSettings class, and added
  TestSanity test case for testing loading and saving the default/blank
  configuration file (test.py)
added pyFileZilla.filezilla_reload_config() and updated other pyFileZilla
documentation
=====
- added pyFileZilla.filezilla_reload_config(), removed ftpUser and
  ftpGroup inheritance, and updated autoclass to use the pyFileZilla
  package classes instead of pyFileZilla.ftpSettings
  (sphinx/pyFileZilla.rst) and updated docs