Create a package manifest containing only github packages
Usage
GithubManifest(..., pkgrepos)
Value
A GithubManifest object representing the specified github repos.
Arguments
...
Combined to populate pkgrepos
pkgrepos
Github repositories in the form "<user>/<reponame>"
Details
Any names of the pkgrepos vector are assumed to be
pkg names for the manifest. For unnamed elements, the pkg
name is assumed to be the repository name.