Added method IChemblAdapter.getTargets to retrieve target IDs given a
UniProt accession.
Added class ChemblSaxParser, which deprecates EbeyeSaxParser (it was
only used for ChEMBL xrefs). This new class processes the ebinocle file
chembl-target_component.xml instead of chembl-target.xml, due to changes
in the content of the latter.