Updated installation notes to describe installation on Python 2.4 and Python 2.5.
Moved merge documentation to the end, reducing the prominence of the docs.
Updated roadmap to reflect current status.
Modernize syntax
Remove internal implementation of ImpImporter and ImpLoader as comments indicate they're only required for Python 2.4.
Move import to the header
Use pkgutil namespace. Still export get_importer as it's referenced in __all__.

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extra : amend_source : fe3ad40ffbb67cc7f3407a37ac42671ea3ecb983