Added more checks to disallow user to enter invalid date formats (Need to work on invalid dates for certain months e.g. 31st February)
Deleted spaces
Added checks for dismantlingTask() and subcommandType for TITLE
Added case TITLE to check for title to allow for subcommand type title
Added a check if user attempted to edit a task that did not exist
Changed error messages
Merge branch 'master' of https://github.com/cs2103aug2014-t7-2/main

# By Natalie Rawle (1) and Yui Wei (1)
# Via Natalie Rawle
* 'master' of https://github.com/cs2103aug2014-t7-2/main:
  Made the multi remove and added a simpler constructor for Add
  fixed repeat