Merge pull request #40 from Martlark/2.0.2

Version 2.0.2 changes most of the properties, hooks and methods to use a more normal Python naming convention.

• Regularly called mixin methods now start with fs_.
• Hook methods start with __fs_ and end with __.
• Control properties start with __fs_ and end with __.
• Some hook functions can now return False or True rather than just raise Exceptions
• fs_get_delete_put_post now returns a HTTP code that is more accurate of the cause