added constant for initial sizing of the article ID hashset used to check for duplicates in the PubmedCentral class
added hashset to check for unique author IDs within an article since we ran into duplicates in the data.  Added clear method called in PubmedCentral when done with an article parser so that all hashmaps, sets, and such are cleared out
Changed handling of hashset for article IDs so that we check for duplicates across journals.  Moved the traverse and load method code within a try-finally block so in finally we can make sure we clear out these hashsets and such.
new jar for Trevor with changes to check for duplicate articles across journals and duplicate authors within an article