Added in basic logic class. not done yet
Added in cases for all the command types available
Add and delete method for logic
Merge branch 'master' of github.com:cs2103aug2014-w13-4j/main into pn-logic-crud
Added in update method
Added in select method
remove select method
remove redundant variable declarations
added isCompleted field for task class
Added in completed method, and removed redundant variables and methods
Merge branch 'chuyu-storage' of github.com:cs2103aug2014-w13-4j/main into pn-chuyu-logic-storage-merge
Added in display method, as well as catches for the exceptions thrown by storage
remove check for valid id, to let storage check for that.
factored out the try and catch blocks
Make logic constructor use the singleton method
Added comments
comment out singleton constructor
remove methods to check whether command contains the param needed
Merge branch 'master' of github.com:cs2103aug2014-w13-4j/main into pn-chuyu-logic-storage-merge

Conflicts:
	src/models/Task.java
Add check that the particular param exists