builtIn types should not warn

[justinbmeyer]

A date instance rendered with {{XYZ}} will warn like:

Previously, the result of XYZ in CanListView:12, was being inserted as HTML instead of TEXT. Please use stache.safeString(obj) if you would like the object to be treated as HTML.

Builtins should not give this warning

[justinbmeyer]

can-stache/src/mustache_core.js

Line 384 in 95b10dc

if(value !== null && typeof value === "object") {

canReflect.isBuiltIn