Update platform to the latest version 

Update all the recent scratch-* and other updates.

Fix integration tests for the recent chrome stable update

Constrain selected sound index to the list of available sounds.

Revert "Remove tooltip from Try It button. (Fixes #1260)"

Remove tooltip from Try It button. (Fixes #1260)

Whole border now highlighted blue

chore(package): update scratch-render to version 0.1.0-prerelease.1516772701

Closes #1323

Update scratch-blocks to the latest version 

Fix spelling of backdrop

Merge pull request #1295 from LLK/greenkeeper/scratch-vm-0.1.0-prerelease.1516215511-prerelease.1516215524

Update scratch-vm to the latest version 

Fix preview deploy

Merge pull request #1289 from LLK/greenkeeper/scratch-vm-0.1.0-prerelease.1516210259-prerelease.1516210276

Update scratch-vm to the latest version 

Unfortunately this will purge unnecessarily after gh-pages deployments, but that should not be an issue.

Update scratch-vm to the latest version

Update scratch-vm to the latest version

Update upstream packages one last time

Manually update the scratch-* deps, greenkeeper seems behind.

Release for January 18 milestone