e2e: typings are invalid for e2e tsconfig

[devversion]

It seems like the e2e are always failing locally and on the CI, because of some incorrect typings.

See for example, CI job: https://travis-ci.org/angular/material2/jobs/135156835

Those typings are quite outdated and hard-copied into the repository. We should better install the typings from the typings manager

• See @types/node + typescript@1.9.0-dev.20160521-1.0 results in duplicate identifier 'stack' error microsoft/TypeScript#8737

As a temporary fix, we can remove the node typings from the e2e typings. (those aren't used yet)
Once we upgrade typescript we can re-introduce the node typings again.

[devversion]

Fixed with SHA a68597e

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