Added typecasting of tasks
Merge branch 'master' of https://github.com/cs2103aug2014-w15-3J/main.git
Merge pull request #31 from cs2103aug2014-w15-3J/master

Merging Master into Logic branch
Merge branch 'Logic' of https://github.com/cs2103aug2014-w15-3J/main.git into Logic
Edited the attributes of superclass Tast
Saving Task class
Implemented sortByTime comparator
Added sorting code to Logic
Stub priority comparator
Merge pull request #33 from cs2103aug2014-w15-3J/Logic

Merge Master with Logic