[zanata/zanata-server] ffaa4f: Update to GWT 2.8.0-rc1

[GitHub]

  Branch: refs/heads/gwt28
  Home:   https://github.com/zanata/zanata-server
  Commit: ffaa4fe3ec4d60c2b95ce6e11415bf4f2889a3f7
      https://github.com/zanata/zanata-server/commit/ffaa4fe3ec4d60c2b95ce6e11415bf4f2889a3f7
  Author: Sean Flanigan <sflaniga at redhat.com>
  Date:   2016-08-08 (Mon, 08 Aug 2016)

  Changed paths:
    M pom.xml

  Log Message:
  -----------
  Update to GWT 2.8.0-rc1