fix(docs): export bootstrap in core.ts but not in core.dart

test(router): add tests for router.d.ts

Closes angular#3282

refactor(ElementBinderBuilder): remove unused code

Closes angular#3326

refactor(di): removed @parent

BREAKING CHANGE
    The @parent annotation has been removed. Use @ancestor instead.
    @parent was used to enforce a particular DOM structure (e.g., a pane component is a direct child of the tabs component).
    DI is not the right mechanism to do it. We should enforce it using schema instead.

chore(package.json): bump version to 2.0.0-alpha.31

chore(packaging): bump version to 2.0.0-alpha.30

chore(packaging): bump version to 2.0.0-alpha.29

chore(packaging): bump version to 2.0.0-alpha.28

chore(release): releases 2.0.0-alpha.27

chore(release): releases alpha.26