Check for exceptions after void method calls
Also add a check in context.R
Merge branch 'master' of https://github.com/amplab-extras/SparkR-pkg into jcheck-void
Specify how to change Spark versions in README
Merge pull request #124 from shivaram/master

Specify how to change Spark versions in README
Merge pull request #123 from shivaram/jcheck-void

Check for Java exceptions after void function calls
Merge remote-tracking branch 'upstream/master'