Update Gitlab-shell to newest

newest version of gitlab-shell avail. (has bug fix)
Dont allow html render for RAW view
Select files with diff filter for graph log
version 6.0.1
Merge pull request #50 from gitlabhq/6-0-stable

6 0 stable
Merge pull request #4974 from endzyme/patch-1

Update Gitlab-shell to newest
Merge pull request #53 from gitlabhq/6-0-stable

6 0 stable
fix conflicts