Implement Continuous Integration to be run on TravisCI
Reference the correct TravisCI instance in README (note: this will refect the build status of the most recent change, regardless of branch) and add a placeholder for a future pic12_executive build
Factor build_all script out of .travis.yml, move automation scripts into a tools/automation directory, fix Vagrant .profile setup, allow build_all to run on non-Travis systems.
Merge remote-tracking branch 'upstream/dev' into test-travis-ci
Merge pull request #118 from amcgee/test-travis-ci

Continuous Integration using TravisCI