improved docstring and generalised _rescale_minmax#228

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kvyh wants to merge 8 commits intoastropy:masterfrom

kvyh:minmax_rescale

Commits on Aug 12, 2016

changing rescale_minmax to not be private
kvyh
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Commits on Aug 13, 2016

updated the test to the new function name
kvyh
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Commits on Aug 15, 2016

removed empty line
kvyh
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