- refreshing to the Cent 7 1511 version of comps.xml
- adding a graphical desktop install option
- refreshing to the Cent 7 1511 version of isolinux.cfg
- adding package depedencies for Mitaka ISO install

JIRA: APEX-104

Change-Id: I73413270d2da656a4421f78a93504b611d300206
Signed-off-by: Dan Radez <dradez@redhat.com>