Merge pull request #740 from code-dot-org/test

DTP
Merge pull request #741 from code-dot-org/test

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Merge branch 'test' of github.com:code-dot-org/code-dot-org into production
Merge pull request #744 from code-dot-org/turn-off-image

turn off image saving -> prod
Merge pull request #752 from code-dot-org/staging

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Merge pull request #756 from code-dot-org/staging

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DTT
Merge pull request #757 from code-dot-org/test

DTP
hotfix hide gallery from studio.code.org
resolve merge conflict