added windows8 support, and added tests
available list of platforms includes windows8
config.xml helper function is used, removed error merge of wp folder.
Bumping elementtree version to 0.1.5 to match plugman and support namespaced xml elements
Fixes a bug where cordova prepare bombs on a config missing a content
element
  - Changes an undefined check to falsey to cover random null value
    returned from elementtree

  Tested By: David Kemp <drkemp@google.com> via Medic
Merge branch 'cordova-3.1.x' of https://git-wip-us.apache.org/repos/asf/cordova-cli into cordova-3.1.x
updated to use 3.1.0
updated to use plugman 0.13.x