…or a given path to support scenarios where the branch point isn't the first changeset; update GitTfsRemote to support setting InitialChangeset externally; update InitBranch to handle setting tfsRemote.InitialChangeset when a given branch's actual branch point is specified instead of assumed. This fixes issue git-tfs#955 for sure - I had the same issue.

…gain) covered by paket

…ket install

… build is failing to compile though local compilation succeeded and ReSharper is suggesting removing the redundant private setter