fix #212, drop messages from zombie tasks
fix AppMasterStarter construct on RecoverApplication
fix wordcount jar path
Merge pull request #228 from manuzhang/fix_app_master_starter_construct

fix AppMasterStarter construct on RecoverApplication
Merge pull request #224 from clockfly/drop_zombie_message

#212, drop messages from zombie tasks
Add description for SOL
Merge branch 'master' into logging
make master and worker logging to their own log files.