merge get and list
merge get and list operation
fix can change the value of a dir bug
remove commented codes
add machinesHttpHandler
Merge pull request #1 from xiangli-cmu/addGetClusterMachines

add machinesHttpHandler
Update README.md
Update README.md
add keyword file to keep keys for internal usage
fix a bug when compare cluster len
record machine info locally via join command
fix a spelling error
Merge pull request #17 from xiangli-cmu/master

merge get and list operation