Allowing browser flag in serve

[Blackbaud-BobbyEarl]

Tested in OSX and Windows against chrome, firefox, safari, iexplore, and edge.

A few notes:

• edge has to be a hard-coded use-case since they only expose a protocol microsoft-edge: instead of an executable.
• This only updates the skyux serve command. Support could also be added for the skyux test, skyux watch, and skyux e2e commands.

Fixes blackbaud/skyux2#402

[codecov-io]

Codecov Report

Merging #167 into master will increase coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #167      +/-   ##
==========================================
+ Coverage   96.06%   96.09%   +0.03%     
==========================================
  Files          38       38              
  Lines         838      845       +7     
  Branches      112      113       +1     
==========================================
+ Hits          805      812       +7     
  Misses         33       33

Flag	Coverage Δ
#builder	100% <100%> (ø)	⬆️
#runtime	100% <ø> (ø)	⬆️
#srcapp	58.75% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
config/webpack/serve.webpack.config.js	100% <100%> (ø)	⬆️

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[Blackbaud-PaulCrowder]

I would suggest changing the expect(<string>).toContain(<url>) lines to be expect(<string>.indexOf(<url>).toBe(0) since you really want to ensure the string starts with the URL and not that it just contains it, since an errant space or other character could cause the test to pass but the code to fail.

[Blackbaud-BobbyEarl]

Good suggestion @Blackbaud-PaulCrowder. Incorporated.

[Blackbaud-BobbyEarl]

Just a heads up @blackbaud-johnly, this is something we'll want to document. I started to write it, but saw the critiques already flowing, so I'll just save us both time and ask that you do it. :-)

[blackbaud-johnly]

Thanks @Blackbaud-BobbyEarl . I already had a note to ask you about this next week.