Add ignored dirs to bower.json
Add ignored dirs to bower.json

pazof/showdown,webutilz/showdown,phw/showdown,bsnizek/showdown,digideskio/showdown,xinshitn/showdown,yaniswang/showdown,snegovick/showdown,axter/showdown,OMGgogong/showdown,twitwi/showdown,digideskio/showdown,juanonsoftware/showdown,twitwi/showdown,pazof/showdown,coolroad/showdown,alazyer/showdown,alazyer/showdown,bsansouci/showdown,showdownjs/showdown,stevemao/showdown,yaniswang/showdown,stevemao/showdown,showdownjs/showdown,phw/showdown,NichenLg/showdown,juanonsoftware/showdown,webutilz/showdown,axter/showdown,snegovick/showdown,NichenLg/showdown,bsnizek/showdown,bsansouci/showdown,coolroad/showdown,xinshitn/showdown,OMGgogong/showdown