Enable 2 CI systems side by side

[ianfixes]

Scope

Enabling CI from https://github.com/adafruit/travis-ci-arduino

No code changes, but extensions of examples had to be changed from .pde to .ino.

Added one unit test. Note that the job status is failing due to an actual failure in the library!

Tests

Travis testing has been enabled. This job (on an OSX machine) shows the error that is fixed by #20

You can also see that error in this job (on a Linux machine), but it lacks the symbolication that shows what functions produced the memory issues.