Revert "[updated] toString methods for Task.java, DeadlineTask.java,"

This reverts commit acfadf424f676517d5990722e469feade10872b8.
Merge branch 'master' of https://github.com/cs2103aug2014-f10-2j/main.git
[added] getDetail() for DeadlineTask.java, FloatingTask.java,
TimedTask.java, Task.java