(xAxis|yAxis)getLabel: support labels different from series/categories identifiers; 
(xAxis|yAxis)getLabel: support labels different from series/categories identifiers; 
dcleao/ccc,dcleao/ccc,dcleao/ccc,Abpaula/ccc,dcleao/ccc,webdetails/ccc,Abpaula/ccc,afrjorge/ccc,davidmsantos90/ccc,davidmsantos90/ccc,afrjorge/ccc,afrjorge/ccc,davidmsantos90/ccc,webdetails/ccc,webdetails/ccc,afrjorge/ccc,Abpaula/ccc,webdetails/ccc,Abpaula/ccc,davidmsantos90/ccc