changed the obsolete script invocation of  "restart-failed-workers.sh"
make both the temp folder and new blocks writable to the worker and the client
Merge branch 'amplab'
Hot Master failover
update to master
fix formatting
remove unnecessary code
formatting
format the code style, use the File.setPosixFIlePermissions to change file permissions
Formatting
merge master
formatting
add interface "changePermission" in UnderFileSystem
Merge branch 'amplab'
Fix the NPE in getClientBlockInfo while INode is a DIR
capsulate the 'changePermission' method invocation  into UnderFileSystem
tachyon: remove previous tables in order to avoid FileAlreadyExistException.
CommonUtils: simplified previous code.
Delete the orphan blocks while initialize WorkerStorage
format the style and change the script invocation due to the new pull
fix scripts in linux.