Changed Add's flushSubCommand()
Merge branch 'master' of https://github.com/cs2103aug2014-t7-2/main

# By Natalie Rawle
# Via Natalie Rawle
* 'master' of https://github.com/cs2103aug2014-t7-2/main:
  Fixed add so it won't throw null errors

Conflicts:
	dataManipulation/Add.java