Updates readme to document plugin usage
Updates readme to document plugin usage

jarvisaoieong/superagent,killerlayup/superagent,h1bomb/superagent,modulexcite/superagent,eligolding/superagent,wushuyi/superagent,simonvizzini/superagent,classdojo/superagent,deltreey/superagent,reinaldo13/superagent,brotchie/superagent,ccapndave/superagent,stanzi83/superagent,wushuyi/superagent,yeatszhang/superagent,yeatszhang/superagent,drinks/superagent,modulexcite/superagent,philipshurpik/superagent,alinz/superagent,craigspaeth/superagent,alinz/superagent,geminiyellow/superagent,zsh2938/superagent,yussan/superagent,kmalakoff/superagent-ls,ertrzyiks/superagent,brainbytes/superagent,visionmedia/superagent,KuroGuo/suberagent,geminiyellow/superagent,kmalakoff/superagent-ls,visionmedia/superagent,andyburke/superagent,mvanlonden/superagent-webpack-client,sutoiku/superagent,andyburke/superagent,drinks/superagent,focusaurus/superagent,simonvizzini/superagent,reinaldo13/superagent,fredigato/superagent,targos/superagent,KuroGuo/suberagent,mvanlonden/superagent-webpack-client,brainbytes/superagent,puterakahfi/superagent,sebastianvera/superagent,bevacqua/superagent,killerlayup/superagent,RubenVerborgh/superagent,focusaurus/superagent,KingMario/superagent,ccapndave/superagent,RubenVerborgh/superagent,philipshurpik/superagent,targos/superagent,sebastianvera/superagent,visionmedia/superagent,puterakahfi/superagent,stasha/superagent,soyuka/superagent,jarvisaoieong/superagent,deltreey/superagent,aaroncrows/superagent,sutoiku/superagent,fredigato/superagent,stasha/superagent,nemisj/superagent,KingMario/superagent,thejameskyle/superagent,h1bomb/superagent,classdojo/superagent,craigspaeth/superagent,noikiy/suberagent,soyuka/superagent,brotchie/superagent,yussan/superagent,stanzi83/superagent,eligolding/superagent,thejameskyle/superagent,noikiy/suberagent,aaroncrows/superagent,ertrzyiks/superagent,zsh2938/superagent,nemisj/superagent