Update and Add Integration Testing
Merge branch 'master' of https://github.com/azatris/cs4218

# By Silver Taza (3) and dwalky (2)
# Via Silver Taza
* 'master' of https://github.com/azatris/cs4218:
  Created integration testing folder
  Updated Sort and Paste to have negative test cases
  Cuttooltest
  cuttool
  quick fix for Greptool for better error handling