Deal with I/O exceptions.
Add an applet class in Scala.
Merge branch '218_attack' into 217_applet
226 adjust the rules
remove comments
Merge pull request #227 from AI-comp/226_AdjustTheRules

226 adjust the rules
fix readme
fix readme
fix readme
Merge pull request #228 from AI-comp/226_AdjustTheRules

fix readme
Fix applet.
Merge branch '217_applet'
fix conflict