Execute command directly without using shell
   use Shellwords.shellwords for splitting origin_cmd instead of .split(' ')
More detailed warning about symlinks in repos_path
Merge pull request #94 from f0k/improve-symlink-warning

More detailed warning about symlinks in repos_path
Merge pull request #87 from bobot/master

Execute command directly without using shell
Version up to 1.7.2
Use Kernel#open to append lines to authorized_keys
Merge branch 'puts_instead_of_echo' of /home/git/repositories/gitlab/gitlab-shell
Version 1.7.3