Title.newFromText should not throw exception for invalid title

[santhoshtr]

The mw.Title in mediawiki core has the following behavior for invalid titles: Use #newFromText to use the logic directly and get null for invalid titles which is easier to work with.

But this library throws errors for invalid characters. Would it be a nice idea to make the behavior consistent with mediawiki core?

[cscott]

In Parsoid we use a wrapper for these cases:

try {
  return Title.newFromText(...args);
} catch (e) {
  return null;
}

This is a little more robust if you assert that the caught error is instanceof TitleError (see PR #42).