Upgrades HtmlUnit and it dependencies

Some major upgrades:
  /htmlunit
  /jetty
  /apache/commons
  /apache/http
  /xerces
  /tomcat/servlet-api

Fixes issue 7224

Change-Id: I36cc569c2926aa59ee7375e719b917d6d3681a43
Review-Link: https://gwt-review.googlesource.com/#/c/4323/

Tag 2.5.1 release.

git-svn-id: https://google-web-toolkit.googlecode.com/svn/tags/2.5.1@11556 8db76d5a-ed1c-0410-87a9-c151d255dfc7

Tag 2.5.1-RC1

git-svn-id: https://google-web-toolkit.googlecode.com/svn/tags/2.5.1-rc1@11498 8db76d5a-ed1c-0410-87a9-c151d255dfc7

Re-tag releases/2.5@11495 as 2.5.0 GA

git-svn-id: https://google-web-toolkit.googlecode.com/svn/tags/2.5.0@11502 8db76d5a-ed1c-0410-87a9-c151d255dfc7

Tagging 2.5 RC2

git-svn-id: https://google-web-toolkit.googlecode.com/svn/tags/2.5.0-rc2@11359 8db76d5a-ed1c-0410-87a9-c151d255dfc7

Tagging the 2.5.0.rc1 release. Was built at r11145.

svn copy https://google-web-toolkit.googlecode.com/svn/releases/2.5@11145 https://google-web-toolkit.googlecode.com/svn/tags/2.5.0-rc1



git-svn-id: https://google-web-toolkit.googlecode.com/svn/tags/2.5.0-rc1@11147 8db76d5a-ed1c-0410-87a9-c151d255dfc7

Tag 2.4.0 release

git-svn-id: https://google-web-toolkit.googlecode.com/svn/tags/2.4.0@10590 8db76d5a-ed1c-0410-87a9-c151d255dfc7

Creating 2.4.0-rc1 tag.



git-svn-id: https://google-web-toolkit.googlecode.com/svn/tags/2.4.0-rc1@10464 8db76d5a-ed1c-0410-87a9-c151d255dfc7

tag the 2.3 release

git-svn-id: https://google-web-toolkit.googlecode.com/svn/tags/2.3.0@10454 8db76d5a-ed1c-0410-87a9-c151d255dfc7

Tag of the code used to create GWT 2.4.0.beta

git-svn-id: https://google-web-toolkit.googlecode.com/svn/tags/2.4.0.beta@10154 8db76d5a-ed1c-0410-87a9-c151d255dfc7