added ability to use tiles stored locally and included modified funct…#1

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drewmarticorenaAWHERE wants to merge 3 commits intomasterfrom

dev_addOfflineStamenMaps

Commits on Oct 24, 2018

added ability to use tiles stored locally and included modified function from RgoogleMaps package for downloading and storing tiles
drewmarticorenaAWHERE
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needed to update this info
drewmarticorenaAWHERE
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Commits on Nov 5, 2018

bug fixes
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