remove rspec-system support
add beaker support

Largely cut'n'pasted from puppetlabs-concat
suppress the package types allow_virtual warning

    Warning: The package type's allow_virtual parameter will be changing its default value from false to true in a future release. If you do not want to allow virtual packages, please explicitly set allow_virtual to false.
pin puppet-lint version < 1.1.0

To work around https://github.com/rodjek/puppet-lint/issues/331
fix ganglia user name on el6.x
fix gemetad.conf template on debian
remove puppet 2.7.14 from travis matrix
remove stale ./tests dir
update .gitignore
add ruby 2.1.4 to travis matrix
restrict the allow_virtual param to puppet 3.6.1+

The package type's allow_virtual param was added in puppet 3.6.1
Merge pull request #23 from jhoblitt/feature/beaker

Feature/beaker
Merge branch 'master' of https://github.com/jhoblitt/puppet-ganglia into jhoblitt-master
Merge branch 'jhoblitt-master'