added shade overlay color and opacity, thumbnail and interlace options#57

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freshmaker74 wants to merge 5 commits intocubicdaiya:masterfrom

freshmaker74:master

Commits on Jul 27, 2016

added shade overlay color and opacity, thumbnail and interlace options (imagemagick only)
tdeutsch-fd
committed

Commits on Aug 1, 2016

Commits on Nov 23, 2016