Address overflow in find_last_node_handle
#63
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I had some problems with
find_last_node_handle()smashing its stack. This PR replaces the recursive version with an iteration that should have similar performance characteristics and which can safely parse inputs that the previous version could not.I wish I had a copy of the document that caused the issue; unfortunately the crash was deep enough in processing the CommonCrawl dataset that it was difficult to find the HTML.