add Blockly editor field to manually toggle scrollbars on/off
Merge pull request #950 from code-dot-org/level_scrollbar_toggle

add Blockly editor field to manually toggle scrollbars on/off
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Make level_num a column rather than property value for artist levels
Merge pull request #958 from code-dot-org/fix_artist_level_num

Make level_num a column rather than property value for artist levels
Merge pull request #959 from code-dot-org/finished

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