picture size reduction#20

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leiyiz wants to merge 3 commits intoodk-x:developmentfrom

leiyiz:development

Commits on Apr 3, 2019

adding ability to reduce the size of a picture when pulling pioctures from the server
leiyiz
committed

Commits on Apr 13, 2019

updated hash for compressed image
leiyiz
committed

Commits on Jun 13, 2019

add ability to respond with reduced size pictures if got appropriate Http POST request.
leiyiz
committed