Improve whitespace handling - Fixes #21 #22
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Instead of trimming each text element as we go, it's better to normalize the complete string at the end. This preserves whitespace between HTML elements.
All whitespace characters within a string are now converted to a single space, according to normal HTML behavior. Line breaks should not be significant and I've updated the test expectations to reflect this. I've also added an example case of an inline element within a microdata property, which would previously cause the issue described in #21.