Add WP8 support for xhr requests to local files

Additionally, phonegap/cordova must be used - as it extends
XMLHttpRequest on the platform.
Enyo-DCO-1.1-Signed-off-by: Jeremy Thomas <jeremy.thomas@palm.com>
ENYO-1959: Force Input onchange event for WP8

Enyo-DCO-1.1-Signed-off-by: Jeremy Thomas <jeremy.thomas@palm.com>
ENYO-1933: Force TranslateScrollStrategy for WP8

Also added windowsPhone property to enyo.platform to distinguish various
differences between IE and Windows Phone.
Enyo-DCO-1.1-Signed-off-by: Jeremy Thomas <jeremy.thomas@palm.com>
ENYO-1959: Forcing blur instead of onchange

Enyo-DCO-1.1-Signed-off-by: Jeremy Thomas <jeremy.thomas@palm.com>
Merge pull request #234 from germboy/master

Add WP8 support for xhr requests to local files

Reviewed-By: Ben Combee (ben.combee@palm.com)