[typo] consistently use commas in operator list

Follow on from 1cdaeaaa4fbf02a7388f1fcbea1c86ef0ea32fed.
fix for WARNING during build
Update UnusedImportsCheck to correctly detect classes in parameters and inline tags nested within block tags.
fixing checkstyle issues
Fixing even more checkstyle issues
sonar banner was added
travis plugin and profile for coverall.io
travis plugin and profile for coverall.io
coverage banner was added
NoLineWrap #20
OneTopLevelClass #21