Closes #5191

Add config for CircleCI

While CircleCI is running in parallel with Travis, let Travis continue to handle the deployments.

Merge pull request #5216 from LLK/revert-5212-greenkeeper/scratch-render-0.1.0-prerelease.20190925202615

Revert "Update scratch-render to the latest version "

Revert "Limit louder effect with a max RMS"

Update scratch-render to the latest version 

Update scratch-audio to the latest version 

Update scratch-blocks to the latest version 

Update scratch-l10n to the latest version 

The requirements for npm publishing and gh-pages are different anyway.

The equivalent config for Travis is only 87 lines long, and easy to read. Can CircleCI be similarly easy to read? Is this easy? Are you still reading this?

Greenkeeper/scratch paint 0.2.0 prerelease.20190923154429

Closes #5201

Don’t push tags to gh-pages

Limit louder effect with a max RMS

Allow Node to use more memory for old space

This flag essentially configures how much memory Node can use. If it’s too low, then Node processes may hang as Node spends time garbage collecting. Increasing it allows more memory to be used before garbage collection is necessary.  Travis VMs have 7.5GB of memory, so set the limit to just below that to avoid running out of memory completely.