[w3c/DOM-Parsing] parseFromString() should be use case-insensitive MIME type matching (#40)

The DOM Parsing spec does not specify whether the type argument passed to parseFromString() is case-sensitively or case-insensitively matched against MIME types. In absence of such a mention the spec. text falls back to a general statement that a reader should assume case-sensitive matching. It does not make sense (to me) that we should be performing case-sensitive matching for MIME types. MIME types are defined to be case-insensitive by <https://tools.ietf.org/html/rfc2045>. 

I suggest we change the spec. text:

> The DOMParser constructor must return a new DOMParser object.
> The parseFromString(str, type) method must run these steps, depending on type:
>
> "text/html"
> ...

To something like:

> The DOMParser constructor must return a new DOMParser object.
> The parseFromString(str, type) method must run these steps, depending on type case-insensitively matching one of the following MIME types:
>
> "text/html"
> ...

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