Remove the irrelevant package.
Review MDNManager
Review the edu.cmu.messagebus.WebClient class
Refactor the name of Domain
Merge branch 'jeremy-branch-1' into jeremy-refactor-branch

Conflicts:
	src/main/java/edu/cmu/messagebus/MDNManager.java
	src/main/java/edu/cmu/messagebus/WebClient.java
Hand over to Vinay to continue
The refactor hasn't been finished.