Logger: displays only first line of output, rest is logged
deployment.php: errors are printed in red; complete exception stack trace is logged
deployment.php: options `purge, before, after` are split by lines (BC break)
FtpServer: improved purge(), renames directories before they are purged [Closes #40]
Deployment: better visualization of purge
Deployment: refactoring, added runJobs()
Deployment: more robust checking for errors in before and after jobs
Deployment: before and after jobs can be system commands (with prefix 'local:'). These commands in before-jobs are executed before others. [Closes #41]
Deployment: before and after jobs can be remote commands (with prefix 'remote:') [Closes #43]