Pyfilesec

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* REFACTOR to provide a class SecFile; completely new API; test suite broken; command-line same, working

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* BF win 7 interactive python was not happy with platform.python_version; use sys.version instead
* IMPROVED documentation
* CHANGED API: `old` removed from decrypt, `pub`/`priv` order switched for rotate, `npub` -> `pub` for rotate

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* BF appdata path on win32

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The latest dev branch is always available at github.com/jeremygray/pyfilesec

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* ADDED sphinx compatible documentation
* ADDED two example demos
* CHANGED umask no longer done via decorator

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* ADDED will refuse to decrypt inside a Dropbox folder
* ADDED warnings about trying to secure-delete a file that might be under version control (svn, git, hg) or Dropbox
* IMPROVED meta-data handling
* IMPROVED pad()-related functions
* IMPROVED logging (still not using a proper logger instance)
* ADDED more tests: command line usage, missing meta-data, Dropbox folder