fix(universal): correct fxLayout rendering, update LICENSE

[CaerusKaru]

• Fixes bug(fxLayout, universal): layout direction is wrong #423
• Remove default value of fxLayout to avoid confusion
• Removed browser checks from style-utils since getDOM will always
  return an implementation with the methods implemented
• Added note about getComputedStyle PR pending
• Updated RxJS to 5.5.0 and added necessary fixes,
  updated other deps
• Added better null and type checking throughout
• Updated LICENSE, see chore: update copyright to Google LLC components#7589

[ThomasBurleson]

@CaerusKaru - has this PR been rebased with latest in master ?

[CaerusKaru]

@ThomasBurleson it’s all synced up

[ThomasBurleson]

@CaerusKaru - Ok, I will review. Thank you for this PR.

[ThomasBurleson]

@CaerusKaru - why did you use a replaySubject(1) instead of a behaviorSubject?

[CaerusKaru]

@ThomasBurleson BehaviorSubject gives an incorrect assumption that all fxLayouts start with a row value. While it's true that fxLayout defaults to row (and still does), anything that subscribes to this value later down the chain is given a false impression.

Enter ReplaySubject(1), which is exactly like the BehaviorSubject, except without the erroneous "default" value. Now if something subscribes, it will wait for the first real value, and anything that subscribes later will still get the current value.

[CaerusKaru]

This is not a dealbreaker for me, and I'd be happy to change it back since it doesn't appear to affect functionality. I just thought it was an improved alternative.

[ThomasBurleson]

@CaerusKaru - Thank you for this PR. Merged in SHA 8dcae02

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