More regex expressions
Merge branch 'master' of https://github.com/cs2103aug2014-w14-1j/main into wd-parser
Default to add command
Fix 12am parsed as 12pm
Add more variations to current command
Implement redo
No need to check for invalid commands
Merge branch 'master' of https://github.com/cs2103aug2014-w14-1j/main into wd-parser

Conflicts:
	src/Controller.java