Added in task model
Added interface for logic and removed old interfaces
add in Command and COmmandBuffer model file
add in storage interface
rename CommandBuffer to OperationBuffer
rename logic interface
Added Command enum
Add params enum
Implemented command object
Added command parser template
add in TaskNotFoundException model
update storage interface
Updated task class with id and calendar for the dates
fixed task class
removed params in constructor for Task model, to add all attributes by set methods
Merge branch 'xy-command' of https://github.com/cs2103aug2014-w13-4j/main
Merge branch 'chuyu-storage' of https://github.com/cs2103aug2014-w13-4j/main
Merge branch 'emmeryn-basic-gui' of https://github.com/cs2103aug2014-w13-4j/main

Conflicts:
	src/logic/ManageCommands.java
Added regex string to each command enum
Added regex string to each param enum