fix(fab): Made initRipple and unbounded props optional

[Maxim-Mazurok]

Reopening #810

This PR is a follow up to this conversation: b62c36f#r33164756

initRipple and unbounded props should be optional.

[codecov-io]

Codecov Report

Merging #854 into rc0.13.0 will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           rc0.13.0    #854   +/-   ##
========================================
  Coverage      94.5%   94.5%           
========================================
  Files            85      85           
  Lines          3496    3496           
  Branches        532     532           
========================================
  Hits           3304    3304           
  Misses           66      66           
  Partials        126     126

Impacted Files	Coverage Δ
packages/fab/index.tsx	92.59% <ø> (ø)	⬆️

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[Maxim-Mazurok]

rc0.13.0 branch is also failing on screenshot tests on my local environment without this PR changes, so I'll just wait till tests are fixed in rc0.13.0.
The only error in Travis was "Error: Timeout of 60000ms exceeded", so the test might be flaky and rerunning build might fix the issue.

[moog16]

Just restarted it. Sometimes travisCI gets slow. And sometimes we need to add some more time to the startup of the webpack server. I hope it doesn't come to that, as we're waiting around 45 seconds for startup now.

[moog16]

Thanks @Maxim-Mazurok !!