[Finishes #71448254]
add tooltips and 'edit' links below level entries in script#show.
add 'edit' link in script#show page.
Adding A/B/C testing to hint generation.
Fixes for test cases.
Merge from finished.
Merge remote-tracking branch 'origin/admin_edit_script_levels' into level-builder
tweaks to level builder workflow
levelbuilder updates. auto-admin access for @code.org accounts on staging.
Updated based on Ellen's comment.
Updated get_best_next_hint to get_third_party_hint.
script builder: create new script
Merge pull request #826 from code-dot-org/finished

deploy to delivered
Merge branch 'finished' into delivered
level builder changes
Merge finished into level-builder
Merge branch 'finished' into delivered
Merge branch 'delivered'
Merge pull request #829 from code-dot-org/finished

DTD
Merge pull request #830 from code-dot-org/finished

DTD
Merge pull request #831 from code-dot-org/finished

Deploy to delivered
Merge pull request #832 from code-dot-org/finished

DTD