CB-6900 fixed spec.7 for wp8

Test needs to check for x-wmapp0:/ instead of file:/ in case of wp
CB-7223 spec.27 marked pending for wp8

since wp8 does not support custom headers
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/cordova-plugin-file-transfer into fixtests
Merge branch 'fixtests'