Specify latest spec helper and beaker in gemfile
Specify latest spec helper and beaker in gemfile

Older versions of puppetlabs_spec_helper don't provide the `rake beaker`
task.  @dcarley had problems with an older beaker version too.

I haven't tried to work out what the absolute minimum version required
is; just found versions which worked and marked them as minimum.

gds-operations/puppet-graphite,gds-operations/puppet-graphite