1) Updated Copy tests and cleanup.
2) Added Move tests.
3) Removed unused dependencies in Shell.java
4) Updated Copy & Move tools to reflect correct status code.
Merge branch 'master' of https://github.com/ruijie89/4218-Shell

Conflicts:
	Shell/src/sg/edu/nus/comp/cs4218/impl/Shell.java
1) Adjusted some indentations.