CB-7242 Added wp8 subdirectory to localPlatforms variable

createmobilespec --wp8 fails, because the path for wp8 on localPlatforms
is incomplete, it requires the wp8 subdirectory to work properly.
Merge branch 'CB-7242' of https://github.com/martincgg/cordova-mobile-spec
CB-7269 Fixes loading cordova.js on windows phone 8.1
CB-7268 Adds option for creating mobilespec application with windows platform
Merge branch 'CB-7268' of https://github.com/MSOpenTech/cordova-mobile-spec