Add specs for authorizations api.
Add specs for authorizations api.

peter-murach/github,davengeo/github,wicky-info/github,samphilipd/github,anabhilash619/github,MalachiTatum/github,durai145/github,piotrmurach/github,joshsoftware/github,firstval/github,befairyliu/github,GistBox/github,yaoxiaoyong/github,cocktail-io/github