[zanata/zanata-server] 177747: Update to GWT 2.8.0-rc2

[GitHub]

  Branch: refs/heads/gwt28
  Home:   https://github.com/zanata/zanata-server
  Commit: 177747c99f1d0e4cc5ec24eda7affa3cc203af65
      https://github.com/zanata/zanata-server/commit/177747c99f1d0e4cc5ec24eda7affa3cc203af65
  Author: Sean Flanigan <sflaniga at redhat.com>
  Date:   2016-08-22 (Mon, 22 Aug 2016)

  Changed paths:
    M pom.xml

  Log Message:
  -----------
  Update to GWT 2.8.0-rc2