* Update project.pbxproj files to say Flutter rather than Chromium
Also, the templates now have an empty organization so that we don't cause people to give their apps a Flutter copyright.
* Update the copyright notice checker to require a standard notice on all files
* Update copyrights on Dart files. (This was a mechanical commit.)
* Fix weird license headers on Dart files that deviate from our conventions; relicense Shrine.
Some were already marked "The Flutter Authors", not clear why. Their
dates have been normalized. Some were missing the blank line after the
license. Some were randomly different in trivial ways for no apparent
reason (e.g. missing the trailing period).
* Clean up the copyrights in non-Dart files. (Manual edits.)
Also, make sure templates don't have copyrights.
* Fix some more ORGANIZATIONNAMEs
* Add build test for Flutter codelabs
* Fix indentation in build test script
* Correct filename for the codelabs build test run by travis
* Change if statement to elif
* Replace echo statements with set -x
* Add BSD-style license
* Add codelabs build test to Cirrus
* Remove codelabs_build_test from Travis.
* Remove codelabs_build_test from travis_script.sh
* Update documentation for codelabs_build_test.sh
* Update readme for build test
* Add link to open a new issue to MDC-Flutter
* Add phrase to address "if you think you really need to break this test, please escalate this"
