incompatible with version 2 of puppetlabs/apt module

[eoly]

travis tests are failing because the api to the puppetlabs/apt module has changed in version 2.0.

https://forge.puppetlabs.com/puppetlabs/apt/changelog#2015-04-07---supported-release-200

manifests/repo/apt.pp

  apt::source { 'erlang':
    include_src => false,
    key         => $key_signature,
    key_source  => $remote_repo_key_location,
    location    => $remote_repo_location,
    repos       => $repos,
  }

looks like include_src, key, and key_source need to be corrected to be compatible with the new apt module

[Vincent--]

See #20