chore: update pubspec.lock file
chore(travis): temporary workaround for issue 1350

Temporarily use Dart SDK 1.6.0-dev.7.0 (instead of 1.6.0-dev.8.0)
to work around issue #1350 / dartbug 20500.

Closes #1353
Revert "chore: update pubspec.lock file"

Revert commit 620d25354642cdf6ebc9ad0a9226e40f808beb9e as it fails on
Travis → https://travis-ci.org/angular/angular.dart/builds/32481112
chore(testing): fix typo
test(dccd): Add a test for swapping references

closes #1158

Closes #1253
[#1164] move `web_components` line to dev_dependencies in the pubspec.yaml

Closes #1321
reflactor(parser): rename parser_static and parser_dynamic into static_closure_map and dynamic_closure_map

Closes #1250
feat(WTF): Add support for WTF

1) Install https://chrome.google.com/webstore/detail/web-tracing-framework/gmdhhnlkjmknaopofnadmoamhmnlicme
2) Enjoy the visibility

Closes #1354