Adds .use() to lib/client.js
Adds .use() to lib/client.js

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