commin
Merge branch 'master' of https://github.com/mw-ding/MigrationProcess.git

Conflicts:
	src/org/cmu/ds2013s/SlaveManager.java
minor error
comments
Merge branch 'master' of https://github.com/mw-ding/MigrationProcess.git
add comments
Merge branch 'mengweiding'
add grep instance