Fixed bug in Parser where sort command generated extra empty string term
Merge branch 'master' of https://github.com/cs2103aug2014-w09-1j/main
Fixed bug where keying in commands without any additional information causes crash
Fixed bug in program where undo/redo were not read as commands
Added timeFormat for MemorySnapshotHandler to remove ("HH:mm") from MyTasksParser
Added functionality to parser whereby keywords and datewords are recognized in updateDateIndex