Run browser functional tests in CI builds (#1487)

.travis.yml

build/repo.targets

client-ts/FunctionalTests/EchoEndPoint.cs

client-ts/FunctionalTests/Program.cs

client-ts/FunctionalTests/Startup.cs

client-ts/FunctionalTests/TestHub.cs

client-ts/FunctionalTests/package-lock.json

client-ts/FunctionalTests/package.json

client-ts/FunctionalTests/run-tests.ts

client-ts/FunctionalTests/selenium/run-ci-tests.ts

client-ts/FunctionalTests/selenium/run-tests.ts

client-ts/FunctionalTests/selenium/tsconfig.json

client-ts/FunctionalTests/ts/Common.ts

client-ts/FunctionalTests/ts/ConnectionTests.ts

client-ts/FunctionalTests/ts/HubConnectionTests.ts

client-ts/FunctionalTests/ts/WebDriverReporter.ts

client-ts/FunctionalTests/ts/WebSocketTests.ts

client-ts/FunctionalTests/ts/index.ts

client-ts/FunctionalTests/wwwroot/default.html

client-ts/signalr/spec/HttpConnection.spec.ts