Short description of what this resolves:
Allows our e2e tests to run on a Windows machine
Changes proposed in this pull request:
Normalize paths using path.join()
Add typeRoots to the root tsconfig file
Change the spawnedCommand based on the OS
Fixes: #11551
* chore(e2e): add livereload server and clean task for e2e
* chore(e2e): refactor to use gulp connect and open
* chore(e2e): WIP remove open, add formatting, add reload task
* wip(e2e): use SystemJS for faster dev e2e rebuilds
* chore(e2e): wip removing old gulp file, old e2e task
update template for e2e and port number
* chore(e2e): wip add SystemJS for dev build of e2e, use those tasks instead
* chore(e2e): uncomment out range components
* chore(e2e): wip fix paths for the e2e tempate
* chore(scripts): update README back to the old way
* chore(e2e): code cleanup
* chore(e2e): split tasks into dev and prod, put common tasks in e2e
* chore(e2e): rename e2e templates and add to readme
* chore(e2e): fix dev build so it will work with snapshot
* chore(snapshot): get snapshot working with dev and prod builds
