12/6/17 greenkeeper updates to react 16.2 related things

Force 1024x768 window size for automated tests

Try to keep new custom procedure inputs in view

Sloves Tab Override

Closes #936

Closes #940

Closes #949

First iteration of procedures modal with block workspace

Temporarily hide WeDo extension

Update music extension image

Fix toolbox xml for broadcast messages

Try using sentry to make bug finding more effective

Add number rounding in variable monitors

Fix only sprite failure

Resolve issue with improperly sized / positioned legacy backdrops

Try fixing travis permissions problem for chrome