fix(transformers): fix breakage from commit 3fb218180b17bdc9808e575e3a9aaf9928fef28b
refactor(ScopeStats): ScopeStats collects information about digest,
flush and assert flush phases.

ScopeStats collects information about all phases and uses
ScopeStatsEmitter to output the results. Scope stats can be started and
stopped at runtime.

Closes #791
fix(ng-model): Do not use valueAsNumber to work around dartbug.com/15788

Closes #694
For #801
test(parser): Relax exception match to support Firefox

For #801
chore(pubspec): adjust dependencies on `browser`

Closes #804.
fix(NgA): Do not cause a scope digect

Fixes #810