Add a script to download sbt if not present on the system
Pass commands down to system sbt as well
Switch from sbt to ./sbt in the README file
Spelling
Make sbt in the sbt directory
And update docs to match
reindent
Code review feedback
Fix indentatation
Finish documentation changes
CR feedback (sbt -> sbt/sbt and correct JAR path in script) :)
Put quote arround arguments passed down to system sbt
Use awk to extract the version
Merge pull request #331 from holdenk/master

Add a script to download sbt if not present on the system

As per the discussion on the dev mailing list this script will use the system sbt if present or otherwise attempt to install the sbt launcher. The fall back error message in the event it fails instructs the user to install sbt. While the URLs it fetches from aren't controlled by the spark project directly, they are stable and the current authoritative sources.