Removed unused imports
Changed initializeRemovers to initalizeCommands
Removed 'removers' and used 'commands' instead.
Merge branch 'master' of https://github.com/cs2103aug2014-t7-2/main

# By Natalie Rawle (1) and Yui Wei (1)
# Via Yui Wei
* 'master' of https://github.com/cs2103aug2014-t7-2/main:
  moved exception handler
  fixed completed and unfinish