fix: when use different count custom properties in CocosBuilder will get wrong custom properties in game
Merge pull request #4240 from xhcnb/fix_master_nodeloader

 Fixed a bug that it will get wrong custom properties when use different count custom properties in CocosBuilder.
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add xaml project for wp8
Merge pull request #5004 from koowolf/xaml_template

add xaml project for wp8