resolve rspec-puppet > 1 deprecation warnings

    DEPRECATION: include_class is deprecated. Use contain_class instead.
add extremely basic rspec-system tests
fix ganglia::gmetad::{install,config} ordering issue

`ganglia::gmetad` would fail on el6.x when the /etc/ganglia dir wasn't present
as it was trying to create the configuration file before the RPM was installed
(which may create that dir).  This wasn't seen in my test env as ganglia::gmond
/ the gmond RPM were always creating that dir.  Turned up by the rspec-system
tests.
fix gmetad.conf handling of an undefined gridname param
Merge pull request #9 from jhoblitt/system_tests

add extremely basic rspec-system tests