Added support of custom summary message returned from Runner.done method.
Use info for summary output.
Changed to display framework summary whenever possible.
Added code to tag test task using Array[String] returned from Task.tags method.
Added .gitattributes file.
Normalize line endings.
Added support of nested test tasks when tests are executed InProcess and sequentially.
Added support of nested test tasks when tests are executed in SubProcess.
Initial working version of makeParallel that support nested tasks.