to satisfy: Support HTML string and HTMLElement as the right-hand side

[papandreou]

By analogy with "regular" to satisfy with arrays it should expect the same number of child nodes and allow extra attributes/styles/classes not mentioned by the RHS.

var htmlElement = document.createElement('div');
htmlElement.setAttribute('foo', 'bar');
htmlElement.setAttribute('baz', 'quux');
expect(htmlElement, 'to satisfy', '<div foo="bar">'); // Passes
expect(htmlElement, 'to satisfy', '<div foo="bar" baz="quux">'); // Passes
expect(htmlElement, 'to satisfy', '<div foo="bar" baz="blaah">'); // Fails