fix race condition between supervisor and nimbus that could lead to infinite crash of stormconf.ser not found. supervisor now carefully snapshots the state in zookeeper before making decisions instead of grabbing it piecemeal. the race condition was due to one of the pieces of data grabbed being null
0.9.0-wip16
update changelog
Merge pull request #1 from nathanmarz/master

merge changes from nathanmarz/storm
Update NOTICE
Merge pull request #485 from anfeng/master

Add Yahoo! copyright notice