Catch exceptions inside «cd» func

[staabm]

Q	A
Issue Type	Feature Request
Deployer Version	6.0.3
Local Machine OS	N/A
Remote Machine OS	N/A

With a task like

task('clx:remote_dirty', function() {
    cd('{{current_path}}');
    $output = run('svn status');

    if (!empty($output)) {
        throw new \Exception("Remote working copy contains uncommitted changes!\n". $output);
    }
});

you can run into errors like

 [Deployer\Exception\RuntimeException (1)]
  The command "readlink /www/apps/relaunch/current" failed.
  Exit Code: 1 (General error)
  Host Name: ci16
  ================

in the error message it mentions a path, which was not mentioned in the recipe.
IMO the error message should also contain a hint to the line of the recipe, in this case cd('{{current_path}}');. otherwise the user of deployer needs to know the internals of deployer to find the actual line throwing/generating the error

[staabm]

also a visual hint inside the stacktrace would be helpfull:

as a user you get a rather large stacktrace, but most of the time the offending line from your recipe is hidden in between

[antonmedv]

Reading stack trace is difficult for users. It's try. My be it's better to handle error inside cd and re throw errors.