add toError tests
add toError tests

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