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file with one function call, regardless of location of the file.

DataSource is meant to augment standard python libraries, not replace them.
It should work seamlessly with standard file IO operations and the os
module.

DataSource files can originate locally or remotely:

- local files : '/home/guido/src/local/data.txt'
- URLs (http, ftp, ...) : 'http://www.scipy.org/not/real/data.txt'

DataSource files can also be compressed or uncompressed.  Currently only
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Example::

    >>> # Create a DataSource, use os.curdir (default) for local storage.
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    >>> # Open a remote file.
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    >>> #     './www.google.com/index.html'
    >>> # opens the file and returns a file object.
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    Notes
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