Merge branch '2.6' into 2.7

* 2.6:
  Update filesystem readme.md to include exists method
  Add machine readable events
  Fixed minor typo
  [FrameworkBundle] Fix server start in case the PHP binary is not found
  Update UPGRADE-2.6.md
  [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

Author: fabpot

README.md

@@ -5,7 +5,7 @@ This component provides a mechanism that allows exploring then dumping
 any PHP variable.
 
 It handles scalars, objects and resources properly, taking hard and soft
-references into account. More than being immune to inifinite recursion
+references into account. More than being immune to infinite recursion
 problems, it allows dumping where references link to each other.
 It explores recursive structures using a breadth-first algorithm.