Filehandles

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**Bugfixes**

- Added `NotADirectoryError` exception to directory opener to
prevent eating up regular files.
- Fixed bz2 opener not supporting seek() operation.

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**Improvements**

- Rewrote `filehandles` module using (EAFP style) and removed path.test()
methods (LBYL style).
- Removed path checking based on `mimetypes`.

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**New features**

- Added 'pattern' argument - regular expression pattern to include files
only with specified pattern.

~~~~~~~~~~~~~~~~~~

**Bugfixes**

- Fixed `Opener` initializer to properly add non-standard extension and type
to `mimetypes` module.

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**Improvements**

- Added `logging` and `verboselogs` logging.
- Replaced all `if verbose: print('...')` with `logger.verbose('...')` calls.

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- Initial public release.