Allow the back button to work with libraries

Merge pull request #1862 from LLK/revert-1861-greenkeeper-pls/scratch-vm-0.1.0-prerelease.1524520946

Revert "Update scratch-vm"

Update scratch-vm

Push to history when the library mounts. Whenever popstate occurs after mounting, request to be closed.

Behavior captured in the `Modal` container. If we want to re-use this functionality for anything else that uses `ModalComponent`, just use the `Modal` container rather than `ModalComponent`.

Make the library filter input full height

Account for filter bar in library grid height

Partially match tags while filtering

Support new scratch-blocks API for translating custom proc mutations

Update scratch-paint to the latest version 

Make MINDSTORMS uppercase as per feedback from LEGO

Merge pull request #1833 from LLK/revert-1832-revert-1829-greenkeeper/scratch-paint-0.2.0-prerelease.20180420154430

Bring in the latest bitmap editor from scratch-paint

Export GUI for use on www!

This prevents the fullscreen modal from being scrollable by removing extra height from the library

This way you can click anywhere to gain focus

Concatenate all the tags plus the library item name into one string and search for a match within that. This allows queries to partially match tags and library item names.

The `\n` delimiter is because my first choices of `' '` or `,` are typeable, and would end up matching everything.

Update the vm to include fixes for downloading imported sounds

Merge pull request #1832 from LLK/revert-1829-greenkeeper/scratch-paint-0.2.0-prerelease.20180420154430

Revert bitmap paint editor PR for now

Update chromedriver to the latest version 

chore(package): update scratch-paint to version 0.2.0-prerelease.2018…

Update scratch-vm version.

Library tweaks

This won't work on a lot of browsers, but temporarily just target modern ones. (Robust solution is possible using classNames and refs)

Closes #1760