[zanata/zanata-platform] 3a6237: Discard artifacts after 4 builds

[GitHub]

  Branch: refs/heads/Jenkinsfile
  Home:   https://github.com/zanata/zanata-platform
  Commit: 3a623726fdc57c1087dc75b2073f7a0009b0d771
      https://github.com/zanata/zanata-platform/commit/3a623726fdc57c1087dc75b2073f7a0009b0d771
  Author: Sean Flanigan <sflaniga at redhat.com>
  Date:   2017-03-28 (Tue, 28 Mar 2017)

  Changed paths:
    M Jenkinsfile

  Log Message:
  -----------
  Discard artifacts after 4 builds