Add test for PullApi.show.
Add test for PullApi.show.

ekristen/node-github,Dica-Developer/github-js,trektech/test1,Phanatic/node-github,kstarsinic/node-github,kaizensoze/github4,F1LT3R/node-github,tempbottle/node-github,kaizensoze/node-github,eistrati/node-github,apiaryio/node-github,jamestalmage/node-github,Gerhut/node-github,ludovicderochethales/node-github,meetearnest/node-github,dfarr/node-github,cbargren/github-xhr,AkashSC/MyRepoDOMO,blamattina/node-github,onesfreedom/node-github,reviewninja/node-github,codeschool/node-github