fix issue with Bar builder line_color not being considerent when grouping or stacking
fix issue with Bar builder line_color not being considerent when grouping or stacking

timsnyder/bokeh,jakirkham/bokeh,msarahan/bokeh,ptitjano/bokeh,aiguofer/bokeh,jakirkham/bokeh,dennisobrien/bokeh,azjps/bokeh,htygithub/bokeh,maxalbert/bokeh,clairetang6/bokeh,ptitjano/bokeh,rs2/bokeh,azjps/bokeh,rs2/bokeh,KasperPRasmussen/bokeh,percyfal/bokeh,philippjfr/bokeh,azjps/bokeh,percyfal/bokeh,DuCorey/bokeh,rs2/bokeh,bokeh/bokeh,ptitjano/bokeh,Karel-van-de-Plassche/bokeh,bokeh/bokeh,philippjfr/bokeh,KasperPRasmussen/bokeh,philippjfr/bokeh,maxalbert/bokeh,aavanian/bokeh,DuCorey/bokeh,rs2/bokeh,philippjfr/bokeh,htygithub/bokeh,jakirkham/bokeh,ericmjl/bokeh,dennisobrien/bokeh,mindriot101/bokeh,schoolie/bokeh,phobson/bokeh,htygithub/bokeh,justacec/bokeh,draperjames/bokeh,schoolie/bokeh,DuCorey/bokeh,DuCorey/bokeh,mindriot101/bokeh,phobson/bokeh,DuCorey/bokeh,rs2/bokeh,bokeh/bokeh,draperjames/bokeh,stonebig/bokeh,timsnyder/bokeh,draperjames/bokeh,schoolie/bokeh,aiguofer/bokeh,ericmjl/bokeh,jakirkham/bokeh,clairetang6/bokeh,stonebig/bokeh,quasiben/bokeh,stonebig/bokeh,jakirkham/bokeh,schoolie/bokeh,justacec/bokeh,KasperPRasmussen/bokeh,quasiben/bokeh,Karel-van-de-Plassche/bokeh,clairetang6/bokeh,timsnyder/bokeh,Karel-van-de-Plassche/bokeh,percyfal/bokeh,philippjfr/bokeh,draperjames/bokeh,mindriot101/bokeh,ericmjl/bokeh,bokeh/bokeh,KasperPRasmussen/bokeh,percyfal/bokeh,ericmjl/bokeh,dennisobrien/bokeh,msarahan/bokeh,maxalbert/bokeh,ptitjano/bokeh,dennisobrien/bokeh,ptitjano/bokeh,stonebig/bokeh,aiguofer/bokeh,clairetang6/bokeh,mindriot101/bokeh,aavanian/bokeh,quasiben/bokeh,timsnyder/bokeh,aavanian/bokeh,timsnyder/bokeh,aiguofer/bokeh,draperjames/bokeh,bokeh/bokeh,justacec/bokeh,phobson/bokeh,aavanian/bokeh,Karel-van-de-Plassche/bokeh,percyfal/bokeh,schoolie/bokeh,ericmjl/bokeh,justacec/bokeh,azjps/bokeh,msarahan/bokeh,aiguofer/bokeh,dennisobrien/bokeh,phobson/bokeh,KasperPRasmussen/bokeh,azjps/bokeh,Karel-van-de-Plassche/bokeh,msarahan/bokeh,maxalbert/bokeh,aavanian/bokeh,htygithub/bokeh,phobson/bokeh