public GistItemViewModel(Gist gist, Action <GistItemViewModel> gotoAction)
{
Gist = gist;
Id = gist.Id;
Title = GetGistTitle(gist);
Description = string.IsNullOrEmpty(gist.Description) ? "Gist " + gist.Id : gist.Description;
Avatar = new GitHubAvatar(gist.Owner?.AvatarUrl);
UpdatedAt = gist.UpdatedAt;
UpdatedString = UpdatedAt.Humanize();
GoToCommand = ReactiveCommand.Create(() => gotoAction(this));
}