Enable 2 CI systems side by side#21

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ianfixes wants to merge 6 commits intoadafruit:masterfrom

ianfixes:2018-09-19_ci_sidebyside

Commits on Sep 19, 2018

Add travis-ci-arduino test script
Ian Katz
committed
fix extensions of examples
Ian Katz
committed
Add parallel testing with arduino_ci
Ian Katz
committed

Commits on Sep 21, 2018

Feature-parity speed test with caching disabled
Ian Katz
committed
add unit test
Ian Katz
committed
use OSX to get better segfault analysis
Ian Katz
committed