only create links for trusted href values

[nhnb]

At the moment, a url value of javascript:alert(document.domain) is converted to <a href="javascript:alert(document.domain)">javascript:alert(document.domain)</a>.

I belief the risk is very low because the javascript code is clearly visible. But it might be a good idea to fix this issue anyway.

Steps to reproduce:

    public static void main(String[] args) throws IOException {
        CSLItemData item = new CSLItemDataBuilder()
            .type(CSLType.ARTICLE_JOURNAL)
            .title("Protein measurement with the Folin phenol reagent")
            .author(
                new CSLNameBuilder().given("G").family("Krüger").build()
            )
            .URL("javascript:alert(document.domain)")
            .build();

        ItemDataProvider provider = new ListItemDataProvider(item);
        CSL csl = new CSL(provider, "ieee-with-url");
        csl.registerCitationItems(item.getId());
        csl.setConvertLinks(true);
        csl.setOutputFormat("html");

        String res = csl.makeBibliography().makeString();
        System.out.println(res);
    }

[michel-kraemer]

Nice catch! Thank you. I'll merge the PR together with your other one (#243).

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