reader: fix Skip(n) where n >= buffer size #22
Merged
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The (*Reader).Skip() code did not handle skip sizes
above the buffer size correctly, because the inner
reader loop only looped while 'r.buffered() < n', and
that condition is obviously violated when the reader
successfully buffers more bytes than are to be skipped.
Refactor this method to be a little shorter and hopefully
much clearer (and more correct) and add test coverage that
exercises this code better.
Fixes #20