Changed gitignore stuff.
Merge branch 'master' of https://github.com/worldgnat/dist-sys-project.git
Merge branch 'master' of https://github.com/worldgnat/dist-sys-project.git
Created a GroupManagement class. This will be created by the RM when it
stars up, and will manage group coordination, as well as sending updates
to the backup nodes. There is also a groupComm package with contains
various message classes that are used by the GroupManagement class. Not
everything is working yet.