adding youtube plugin
adding youtube plugin

kylemsguy/limbo,michaelMinar/limbo,uilab-github/slask,Marclass/limbo,mmisiewicz/slask,ruhee/limbo,cmyr/debt-bot,UnILabKAIST/slask,llimllib/limbo,TetraEtc/limbo,shawnsi/limbo,freshbooks/limbo,joshshadowfax/slask,palachu/sdbot,akatrevorjay/slask,TetraEtc/limbo,sentinelleader/limbo,Whirlscape/debt-bot,dorian1453/limbo,uilab-github/slask,llimllib/limbo,NUKnightLab/slask,serverdensity/sdbot,rizaon/limbo,signalnine/alanabot,kesre/slask,wmv/slackbot-python