SPARK-33, and bumped spark version info to 2.7.0
Merge pull request #3 from SnakeDoc/fixnormalization

Complete repo normalization crlf -> lf
Merge pull request #4 from SnakeDoc/master

fix ant warning, explicit set default value
Merge pull request #5 from SnakeDoc/fixsparkversioning

SPARK-33, and bumped spark version info to 2.7.0
fixed fastpath plugin build, was depending on empty directories
fixed roar plugin build, was depending on empty directories
fixed tictactoe plugin, was depending on empty directories
fixed battleships plugin build, was depending on empty directories