singleton for task storage
singleton for storage
Make logicApi a singleton class
Shifted initialize as part of the getInstance method
Fix test
Merge branch 'pn-singleton-logic' of github.com:cs2103aug2014-w13-4j/main into singleton-storage-chuyu
Make LogicApi adopt the singleton method, fix the storage singleton class, and fix task storage test
Merge remote-tracking branch 'origin/singleton-storage-chuyu'