[api] Adding support for multiple paths at once in `router.on`.
[api] Adding support for multiple paths at once in `router.on`.

pocketjoso/director,GerHobbelt/director,ks3dev/director,GerHobbelt/director,webx32/director,stonegithubs/director,sheldonzf/director,pandoraui/director,tanzhihang/director,lzhengms/director,lzhengms/director,fadeit/director,mylikes/director,meleslilijing/director,kiritoe/director,tanzhihang/director,ks3dev/director,mylikes/director,pandoraui/director,webx32/director,meleslilijing/director,sheldonzf/director,maxogden/director,fadeit/director,cpg1111/director,flatiron/director,vitalsource/director,cpg1111/director,vitalsource/director,andradedev/director,andradedev/director,kiritoe/director,stonegithubs/director,pocketjoso/director