Combine paths using Path.Combine, as per http://www.mono-project.com/Guidelines:Application_Portability#Path_Separators
More logging up to point where zipFile extraction is attempted (and we bump into http://dotnetzip.codeplex.com/workitem/15236)
Merge branch 'lumberjack_direct_shipping' of https://github.com/cityindex/logsearch-ciapi_latency_monitor-bot into lumberjack_direct_shipping

# By fandrei
# Via fandrei
* 'lumberjack_direct_shipping' of https://github.com/cityindex/logsearch-ciapi_latency_monitor-bot:
  bugfix
  fixed executable attribute for nix systems
  bugfix (correct paths for nix systems)
  refactoring
  use SharpZipLib instead of DotNetZip (due to Linux compatibility issues)
  refactoring

Conflicts:
	src/Monitors/Common/Lumberjack.cs