fix formatting of gallery page
fix blank level source images
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add a space
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Merge pull request #474 from code-dot-org/public-gallery

“fix” blank gallery images; gallery page pixel tweaking
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Merge pull request #477 from code-dot-org/feedback_collect

Remove experiment set up for feedback design, and turned on personalized feedback.
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Merge pull request #479 from code-dot-org/feedback_collect

Fixing the test cases.
Added the checks to turn off feedback experiment.
Merge branch 'finished' into feedback_collect
More test fixes...