* 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"
