converted vs2012 project to vs2013

--HG--
rename : example/example-vs2012.vcxproj => example/example-vs2013.vcxproj
rename : libanim-vs2012.sln => libanim-vs2013.sln
rename : libanim-vs2012.vcxproj => libanim-vs2013.vcxproj
rename : libanim-vs2012.vcxproj.filters => libanim-vs2013.vcxproj.filters
merged

--HG--
rename : example/example-vs2012.vcxproj.filters => example/example-vs2013.vcxproj.filters
now merged
invalidate_cache should also invalidate children's caches recursively