separated methods into a task modifer class
Merge branch 'emmeryn-basic-gui' of github.com:cs2103aug2014-w13-4j/main into emmeryn-basic-gui

Conflicts:
	src/interfaces/ILogic.java
	src/logic/Logic.java
	src/logic/TaskModifier.java
	src/tests/LogicTest.java
Throw error when displaying individual deleted task