[HttpKernel] Removed deprecated Kernel::init() method
[FrameworkBundle] Fix server start in case the PHP binary is not found
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
Merge branch '2.7'

* 2.7:
  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
feature #12461 [HttpKernel] Removed deprecated Kernel::init() method (saro0h)

This PR was merged into the 3.0-dev branch.

Discussion
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[HttpKernel] Removed deprecated Kernel::init() method

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | yes
| Deprecations? | no
| Tests pass?   | maybe
| Fixed tickets | ~
| License       | MIT
| Doc PR        | ~

Commits
-------

37b49e1 [HttpKernel] Removed deprecated Kernel::init() method