Add backslashes around Rscript source
fix quotes on .travis.yml
Revert "fix quotes on .travis.yml"

Committed the wrong thing

This reverts commit e5650efd211ef0177163d66919c0ddc484e3a3d6.
fix quotes on .travis.yml
Merge pull request #4 from Reproducible-Science-Curriculum/fix-travis

Fix quotes around Rscript source in .travis.yml