Fixed case for empty folder
Update filesystem readme.md to include exists method
Merge branch '2.3' into 2.5

* 2.3:
  Update filesystem readme.md to include exists method
  Add machine readable events
  fixed typo
  [Translations] Added missing Hebrew language trans-unit sources
  [DependencyInjection] inlined factory not referenced
  Fixed case for empty folder
Merge branch '2.5' into 2.6

* 2.5:
  Update filesystem readme.md to include exists method
  Add machine readable events
  [HttpKernel][2.6] Adding support for invokable controllers in the RequestDataCollector
  fixed typo
  [Translations] Added missing Hebrew language trans-unit sources
  [DependencyInjection] inlined factory not referenced
  Fixed case for empty folder
  Fixed whitespace control for password form widget
  [Routing] correctly initialize condition as string