Moved this method to ExactMatchSearcher
Changed some lines in remove
Wrote an exactTaskSearch to search for a task and return it if found, null if not.
Merge branch 'master' of https://github.com/cs2103aug2014-t7-2/main

# By Natalie Rawle (2) and Yui Wei (2)
# Via Natalie Rawle
* 'master' of https://github.com/cs2103aug2014-t7-2/main:
  Added a way to recover from a corrupt file and the overdue command
  Added "Date" to the list of subcommands
  sorry undid the printlns in the previous push
  no message