Remove tool/playground from source control, add to .gitignore (fixes #293)
Remove the SET_QUALIFIED_ATTR rule from ActionSplitter since it provides no additional functionality (fixes #295)
Merge pull request #296 from sharwell/fix-295

Remove the SET_QUALIFIED_ATTR rule from ActionSplitter
Merge pull request #294 from sharwell/fix-293

Remove tool/playground from source control, add to .gitignore
update 4.0 to 4.1 in text
Merge pull request #297 from parrt/master

update README / CHANGES 4.0 to 4.1
Update development version to 4.1 (from 4.0.1)
Update referenced maven plugin version numbers
Simplify ArrayPredictionContext.isEmpty()
Documentation updates prior to release
Merge pull request #298 from sharwell/build-updates

Build updates
Merge remote-tracking branch 'antlr/master' into optimized