Add missing property_containers.py that should have been in previous commit
Add missing property_containers.py that should have been in previous commit

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