edited unit tests for sort and postpone
Merge branch 'master' of https://github.com/cs2103aug2014-w14-3j/main
Merge branch 'master' of https://github.com/cs2103aug2014-w14-3j/main
Merge branch 'master' of https://github.com/cs2103aug2014-w14-3j/main
added multiple postpone and done