Fix issue #180 (maybe) by adding a shell script to download sbt for users without sbt and reference it in the README. This is the approach we have taken in both Spark & with the examples in the Learning Spark book.
Merge pull request #230 from holdenk/issue-180-make-building-package-simpler-by-adding-sbt

Fix issue #180  by adding a shell script to download sbt for developers