Speed local setup

[mcasimir]

Changes:

1. Only download chromium in CI and use it if necessary.
2. Add few commands to the main package.json:
   • bootstrap-with-chromium: always download chromium
   • bootstrap-without-compass: do not link and install compass-shell
   • bootstrap-ci: used in evergreen, run lerna and npm commands in 'ci' mode: without altering package-lock.json
3. bootstrap will not run the prepublish script anymore. This means that compile-ts and webpack are not run automatically on every install.

[aherlihy]

SGTM, one question: is there a reason we don't want to compile-ts when we bootstrap? It pretty much needs to happen each time you bootstrap since you wouldn't bootstrap without having some code changes or wanting to build

[mcasimir]

SGTM, one question: is there a reason we don't want to compile-ts when we bootstrap? It pretty much needs to happen each time you bootstrap since you wouldn't bootstrap without having some code changes or wanting to build

compile-ts was run as part of prepublish that's why is gone. npm run start[-*] also does compile-ts, should not be an issue, but we can do a postbootstrap: "compile everything except browser". Let me know.