Add setting for git_ssh path.

Use symlink_path in GitShell This is where the symlinked repos are stored. Before, the `@repos_path` was a symlink in the filesystem to the `symlink_path`. Now we directly use that path.

refer to wiki page on git/ssh access denied.

use STDERR consistently across git shell.

fix maintenance mode for git Ontohub::Application is not available in git mode, as we do not preload the whole rails environment. To get to related settings one needs the assume this: Ontohub::Application.config ~= Settings.

Maintenance mode for Ontohub Added capistrano tasks to disable the web interface and the Git shell for maintenance.

use git_home instead of git_root git_root is the actual directory where the bare git repositories are stored. git_home is the directory with the bare-git-repo symlinks, which are named after the name of the repository instead of its id. Also use the symlink-dir to get to the repositories.

Remove unnecessary OntohubConfig and refactor.

One step more towards SSH access

refactor naming of git-shell parameters.

remove missing actions and adjust url for git-ssh.

Adjust git-ssh settings to current config.

modify gitshell to query our sshaccess controller.

git shell and git hooks added