fix bug of deleting the root
	modified:   etcd_handlers.go
	modified:   file_system/file_system.go
	modified:   file_system/node.go
	deleted:    transporter_test.go
Merge branch 'fileSystem' of https://github.com/xiangli-cmu/etcd into fileSystem
fix bug of deleteing the root
gofmt
Merge pull request #13 from evan-gu/fileSystem

fix bug of deleting the root