build(tests): add misc test build target to travis

[redallen]

What: See title. Should fail PRs like #1255 that break packages/react-* tests.

Additional issues:

[patternfly-build]

PatternFly-React preview: https://1556-pr-patternfly-react-patternfly.surge.sh

[codecov-io]

Codecov Report

Merging #1556 into master will increase coverage by 0.2%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #1556     +/-   ##
=========================================
+ Coverage   83.62%   83.82%   +0.2%     
=========================================
  Files         552      556      +4     
  Lines        5751     5856    +105     
  Branches       12       12             
=========================================
+ Hits         4809     4909    +100     
- Misses        940      945      +5     
  Partials        2        2

Flag	Coverage Δ
#patternfly3	84.89% <ø> (ø)	⬆️
#patternfly4	81.4% <ø> (ø)	⬆️
#patternflymisc	95.65% <ø> (?)

Impacted Files	Coverage Δ
packages/react-icons/src/common.js	100% <0%> (ø)
packages/react-icons/src/createIcon.js	100% <0%> (ø)
packages/react-codemods/transforms/pf3-pf4.js	94.04% <0%> (ø)
packages/react-codemods/componentConfig.js	100% <0%> (ø)

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