Ray Pereda

I ran into the same issue as @sublimotion and @GanjinZero when running `parse_pubmed_xml` on an article downloaded last week, `pubmed21n1298.xml`. ```python dict_out = pp.parse_pubmed_xml('data/pubmed21n1298.xml') # errors ``` I can confirm...

I suggest posting code on the pull request. Clearly explain what you expected, or wanted, with a test case. Additional nodes can be added to the parser.