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Merge branch 'master' of https://github.com/azatris/cs4218

# By Silver Taza (3) and Mingxia Liu (1)
# Via Silver Taza
* 'master' of https://github.com/azatris/cs4218:
  Fixed typo
  Updated constructors to remove vulnerabilities
  Added testcases for GrepTool and found, fixed vulnerabilities
  Change to define tool object in each test case

Conflicts:
	src/sg/edu/nus/comp/cs4218/impl/fileutils/CatTool.java