Checksum validation fail using Maven

https://travis-ci.org/preesm/graphiti/builds/551545973 is helpful, you should be able to replicate it locally by the following in your ~/.m2/settings.xml file:

  <mirrors>
    <mirror>
      <id>google-maven-central</id>
      <name>Google Maven Central</name>
      <url>https://storage-download.googleapis.com/maven-central/repos/central/data/</url>
      <mirrorOf>central</mirrorOf>
    </mirror>
  </mirrors>

I’ll look into the missing files – if that’s all it is, I should be able to fix in an hour or two, but figuring out why might take longer. Will update the issue in 30 min.