chore(build): Add Microsoft Edge launcher; add it to CI - #3888

OK, I get:

ERROR [launcher.sauce]: Can not start microsoftedge (Windows 10)
  [init({"selenium-version":"2.45.0","command-timeout":600,"idle-timeout":600,"max-duration":5400,"base":"SauceLabs","browserName":"microsoftedge","platform":"Windows 10","version":"","tags":[],"name":"Angular2","tunnel-identifier":"9038.3","record-video":false,"record-screenshots":false,"build":"TRAVIS #9038 (77692599)","device-orientation":null,"disable-popup-handler":true})] The environment you requested was unavailable.
  {"status": 13, "sessionId": "f5c94a7f045f4335b2b0df70e6f5cc5e", "value": {"message": "The Sauce VMs failed to start the browser or device\nFor more info, please check https://docs.saucelabs.com/reference/troubleshooting-common-error-messages"}}

According to Sauce docs this is most likely due to a mismatched Selenium version. I'd guess it has to be updated to v2.46 to make it work but Protractor requires 2.45.1 currently. So this is probably not going to fly until angular/protractor#2377 is fixed in Protractor.

AFAIK edge was added to SauceLabs recently. @mzgol could you re-base / re-push your PR to check?

@pkozlowski-opensource Done. However, I think Sauce Labs already had Edge in the API when I submitted this PR so the error was most likely caused by what I wrote - a too old Selenium version enforced.

I'm not able to see anything in this test run, though, as the build is completely broken on Firefox & spits out so many errors that it stops: https://travis-ci.org/angular/angular/jobs/80625546.

@mzgol ping?

@tbosch Pong. :) I think this PR needs to wait for a webdriver update from 2.45.1 to 2.47 as Sauce Labs apparently doesn't support Edge with older versions. This may mean we need to wait at least for the next Protractor version as well (although I'm not 100% sure).

The same update is being tried in #4260, but the webdriver update is not enough, see the discussion there.

OK, I guess I'll close this PR then as the other one has more discussion and it's still not everything that's needed anyway.

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