[issue15295] Import machinery documentation

[Eric Snow]

Eric Snow added the comment:

Sounds good to me.  As I understood them:

1. default path importer (a.k.a PathFinder),
2. path hook (lives on sys.path_hooks),
3. path entry handler (finder look-alike that a path hook returns),
4. module loader (business as usual).

A "path entry handler" would stand in contrast to a "meta path finder".  These two would also map well to ABCs for issue15502.

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<http://bugs.python.org/issue15295>
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