Fix for issue 74 (https://github.com/jshiell/checkstyle-idea/issues/74):
Use IntelliJ FileChooser instead of standard JFileChooser so that file selection works correctly for Darcula theme on OSX
Merge pull request #81 from sishbi/master

Fix for issue 74 (https://github.com/jshiell/checkstyle-idea/issues/74):