Merge pull request #4 from djosephsen/master

Added documentation for Graphite integration features
Enhanced sFlow support (sFlow-HTTP, sFlow-MEMCACHE, sFlow-JVM).  Also
improves handling of hypervisors+VMs monitored with sFlow-HOST.
sFlow update
Merge pull request #5 from sflow/master

Updated sFlow collection in gmond (for VM, HTTP, Java and Memcached metrics)
Change default behavior to eliminate support for case-sensitive hostnames (which may still exist in legacy environments), so that new installs will have case-insensitive (lowercase) hostnames by default.
Set ganglia-web to be a submodule
Add submodule instructions (mostly for ganglia-web).
Amend gmetric to send optional CLUSTER attribute.
Adjust packaging for 4.0.0 release, dependent ganglia-web support, etc.
Remove web Makefile dependency
Spec file fixes
Up the submodule to ganglia-web 4.0.0
Remove gmetad-python from specfile
Remove web from make install
Further SPEC files fixes
Move to 4.0.0 version.
Merge branch 'master' of github.com:ganglia/monitor-core
Make most of the unused modules disabled.
Merge branch 'master' of https://github.com/ganglia/monitor-core
Update the Ganglia spec to take into account pyconf.disabled