Mpw

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- [CHANGE] Ask the user three times for their password if they make a typo
instead of giving up after the first time.

- [NEW] Implemented v3 of the algorithm. It behaves like v2 implemented in
mpw 0.3, because I accidently fixed the problems of the official v2
implementation in my own implementation.

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- [CHANGE] ``mpw get`` no longer creates a user or site if they don't exist.

- [CHANGE] New config file format.

- [NEW] Support for multiple versions of the Master Password algorithm

- [NEW] Implemented version 2 of the algorithm

- [NEW] A hashed version of the master key is stored on disk to notify you if
you make typos.

- [NEW] The users' sites are now being encrypted on disk

- [NEW] Users can now change their master password

- [NEW] Passwords can now be echoed to ``stdout`` and thus be piped to other
commands.

- [NEW] Lots of test to ensure compatibility with the reference implementation

- [NEW] 100% line and branch coverage

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- [NEW] Added a lot of subcommands that allow you to store user and site
configuration in a config file

- [CHANGE] ``mpw SITE`` is now ``mpw get SITE``

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- Initial release.