Updated commands
cd updated
updated rmdir

Merge branch 'master' of https://github.com/navinpai/OSMT2013.git

Conflicts:
	src/main/java/org/iiitb/os/os_proj/App.java
	src/main/java/org/iiitb/os/os_proj/controller/Controller.java
	src/main/java/org/iiitb/os/os_proj/shell/Shell.java