* Revert "fix(d.ts): enable angular2 compilation with TS flag --strictNullChecks (#8902)"
This reverts commit 7e352a27f7.
* test: add typescript test for our typings
This ensures we run in a clean directory, using our real distribution. It finds bugs like @internal
APIs needed to type-check in the offline compiler, as well as problems in package.json.
Also move tsc-wrapped under tools/@angular