Add: travis-ci build testing
Add: travis-ci build testing

Basic automated gitbook build testing using travis-ci

Academany/FabAcademy-Tutorials,EDUARDOCHAMORRO/FabAcademy-Tutorials,FabLabWgtn/FabAcademy-Tutorials,EDUARDOCHAMORRO/FabAcademy-Tutorials,EDUARDOCHAMORRO/FabAcademy-Tutorials,FabLabWgtn/FabAcademy-Tutorials,Academany/FabAcademy-Tutorials,FabLabWgtn/FabAcademy-Tutorials,Academany/FabAcademy-Tutorials