added cases for ChemSpider, PubChem-Compound, Chebi.  changed regex to work with any gpml with the WPID in the name. 
added cases for ChemSpider, PubChem-Compound, Chebi. 
changed regex to work with any gpml with the WPID in the name. 

git-svn-id: 6d8cdd4af04c6f63acdc5840a680025514bef303@3877 4f21837e-9f06-0410-ae49-bac5c3a7b9b6

egonw/pathvisio,egonw/pathvisio,egonw/pathvisio,egonw/pathvisio,egonw/pathvisio