Proof of concept how to let a Processing project be tested by Travis CI.
Its goals:
hello_worldshould be verified to compile by Travishell_worldshould be verified not to compile by Travismultitab_hello_worldshould be verified to compile by Travismultitab_hell_worldshould be verified not to compile by Travis
First two goals are achieved.
Note that these projects have a cleaner build script, build.sh, that is identical for all projects.

