Remove .sb from file browser filter since we can't support them yet. Remove .zip from the same. Save project as .sb3 (and untitled-project).

scratch-audio depends on sound property being called md5 even though it refers to md5+file ext,
so this property cannot be renamed just yet.

This reverts commit dee7195f.

Load button file input should only accept specific file extensions. Update load button to use new revamped loadProject function from VM. Loading a project via load button should clear the url hash (without triggering a reload or the project-loader-hoc).

Fix reload button on error page 

Allow new sprite to propagate before selecting costume tab

Update scratch-paint to the latest version 

Save and Load sb3 projects

Merge pull request #1600 from LLK/greenkeeper/scratch-vm-0.1.0-prerelease.1520606673-prerelease.1520606691

Update scratch-vm to the latest version 

Update scratch-paint to the latest version 

Update react-style-proptype to the latest version 

Removing JSZip dependency. VM will unpack the zip (for now, until this functionality gets moved to scratch-storage).

Update scratch-blocks to the latest version 

Update make-toolbox-xml.js

Update scratch-paint to the latest version 

Always report mouse-up to VM and send flag indicating end of drag

Update react-responsive to the latest version 

Try using headless chrome for integration tests

Minor fixes to sprite library

Update chromedriver to the latest version 

Update scratch-paint to the latest version