updated version to 3.0
[HttpKernel] Removed deprecated Kernel::init() method
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
----------

[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
Merge branch '2.7'

* 2.7:
  Extract an AbstractEventDispatcherTest from EventDispatcherTest and also use it in ContainerAwareEventDispatcherTest
  [SecurityBundle] Authentication entry point is only registered with firewall exception listener, not with authentication listeners
  be smarter when guessing the document root
  Azerbaijani locale
  Fixed grammar error in docblock
  [HttpKernel] fix parse error in DumpDataCollector
  [TwigBundle/DebugBundle] move dump extension & cleanups
  Adjust upgrade file rendering
  [Bridge/Propel1] Changed deps to accepts all upcoming propel1 versions
  compare version using PHP_VERSION_ID
  [Form] Add doc for FormEvents
  *_timezone changes also affect the BirthdayType
  don't override internal PHP constants
  Drop support for model_timezone and view_timezone options in TimeType and DateType.
  [DomCrawler] Added support for link tags in the Link class
  [Session] Fix parameter names in WriteCheckSessionHandler
  Add consistency with request type checking
  [FrameworkBundle] Fix server run in case the router script does not exist
Merge branch '2.7'

* 2.7: (36 commits)
  [Debug] fix error message on double exception
  [Validator] make DateTime objects represented as strings in the violation message.
  [RFC] [DebugBundle] [HttpKernel] Avoid using container as dependency for DumpListener
  Upgrade information for the Translation component regarding the new LoggingTranslator class.
  [WebProfilerBundle] Remove usage of app.request in search bar template
  Fix initialized() with aliased services
  fix data type in docblock
  Rename Symfony2 to Symfony
  bumped Symfony version to 2.6.0
  updated VERSION for 2.6.0-BETA2
  updated CHANGELOG for 2.6.0-BETA2
  [Debug] fix ENT_SUBSTITUTE usage
  compare version using PHP_VERSION_ID
  backport #12489
  remove an unneeded check
  Remove block submit_widget
  reformat code as suggested by @fabpot
  Fix typo
  Make `\Request::get` more performant.
  properly set request attributes in controller test
  ...
[MonologBridge] added the deprecated error trigger in the monolog logger emerg(), crit(), err() and warn() methods
[HttpKernel] added the deprecated error trigger in the NullLogger emerg(), crit(), err() and warn() methods