Directly from GitHub:
References
Certain references are auto-linked:
- SHA: be6a8cc1c1ecfe9489fb51e4869af15a13fc2cd2
- User@SHA ref: mojombo@be6a8cc1c1ecfe9489fb51e4869af15a13fc2cd2
- User/Project@SHA: mojombo/god@be6a8cc1c1ecfe9489fb51e4869af15a13fc2cd2
- #Num: #1
- User/#Num: mojombo#1
- User/Project#Num: mojombo/god#1
It seems that directly (as in user/repo/branch) is not possible, but maybe by using the id of the tree?