Remove unused svn keywords

Updated MANIFEST.in declaration.

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extra : convert_revision : svn%3A993dc4b6-72fc-0310-9b3e-91fa30ebc9a8/pywt/trunk%40170

corrected install instructions for easy_install

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extra : convert_revision : svn%3A993dc4b6-72fc-0310-9b3e-91fa30ebc9a8/pywt/trunk%4065

set svn keywords

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extra : convert_revision : svn%3A993dc4b6-72fc-0310-9b3e-91fa30ebc9a8/pywt/trunk%4045