Reparse tiles when zoom level > source maxzoom

so that layout property functions are applied correctly
and so that label placement is redone

js:
https://github.com/mapbox/mapbox-gl-js/pull/1005
and
440bc02505

src/mbgl/map/transform_state.cpp

@@ -8,8 +8,8 @@ using namespace mbgl;
 
 #pragma mark - Matrix
 
-void TransformState::matrixFor(mat4& matrix, const TileID& id) const {
-    const double tile_scale = std::pow(2, id.z);
+void TransformState::matrixFor(mat4& matrix, const TileID& id, const int8_t z) const {
+    const double tile_scale = std::pow(2, z);
     const double tile_size = scale * util::tileSize / tile_scale;
 
     matrix::identity(matrix);