Add k1 loop block
Add k1 loop block image
include node-sass in package.json
Merge pull request #505 from sethco/master

Include node-sass in package.json
Add extra npm packages

@sethco's build required installing a few extra packages, adding them to the install guide.
Remove manual npm install
Update README.md
Add common block module. Add simplified repeat block to maze and turtle
Remove unused skin image definition
some more jigsaw tuning
[Continues 68414526]: add minWorkspaceHeight
Merge pull request #507 from code-dot-org/jigsawTuning

[Finishes #69855032] some more jigsaw tuning
Merge pull request #508 from code-dot-org/studio_day6a

[Continues 68414526]: add minWorkspaceHeight
Install common blocks before app-specific
[Continues 68414526]: fix bug: quote strings in say block
Review revisions: use constants for image parameters. Point out generator re-use.
Merge pull request #506 from code-dot-org/k1_artist_changes

Add K1 simplified repeat block to maze and artist
Do not display level instructions when blank [finishes #69297026]
Translations
Merge pull request #509 from code-dot-org/support_disabling_instructions_69297026

Do not display level instructions when blank [finishes #69297026]