[Security] renamed Constraint namespace to Constraints for validator classes in order to be consistent with the whole current validator API.
[Security] fixed session creation when none is needed (closes #6917)
merged branch hhamon/user_password_constraints_namespace (PR #6960)

This PR was merged into the 2.2 branch.

Commits
-------

35b62ac [Security] renamed Constraint namespace to Constraints for validator classes in order to be consistent with the whole current validator API.

Discussion
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[Security] renamed Constraint namespace to Constraints for validator classes in order to be consistent with the whole current validator API.

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | yes (for people already using the ``UserPassword`` constraint class in their code)
| Deprecations? | yes
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -
Added BCrypt password encoder.
fixed CS
[Security] fixed interface implementation (closes #6974)
Merge branch '2.1' into 2.2

* 2.1:
  [HttpKernel] fixed the creation of the Profiler directory
  [Security] fixed session creation when none is needed (closes #6917)
  [FrameworkBundle] removed obsolete comment (see 2e356c1)
Merge branch '2.2'

* 2.2:
  [HttpFoundation] fixed Request::create() method
  [HttpKernel] fixed the creation of the Profiler directory
  [HttpKernel] fixed the hinclude fragment renderer when the template is empty
  bumped Symfony version to 2.2.0-RC2-DEV
  [DependencyInjection] enhanced some error messages
  [FrameworkBundle] fixed typo
  fixed typo
  tweaked previous merge
  [Security] fixed interface implementation (closes #6974)
  Add "'property_path' => false" deprecation message for forms
  fixed CS
  Added BCrypt password encoder.
  updated VERSION for 2.2.0-RC1
  Removed underscores from test method names to be consistent with other components.
  [Security] fixed session creation when none is needed (closes #6917)
  [FrameworkBundle] removed obsolete comment (see 2e356c1)
  Micro-optimization
  [FrameworkBundle] removed extra whitespaces
  [Security] renamed Constraint namespace to Constraints for validator classes in order to be consistent with the whole current validator API.
  [FrameworkBundle] fixed wrong indentation on route debug output
added Universal* classes in the list of deprecated classes for 3.0
updated required versions when depending on the EventDispatcher component
updated required versions when depending on the Routing component
updated required versions when depending on the Validator component
updated required versions when depending on the Form component
updated required versions when depending on the HttpKernel component
updated required versions when depending on the HttpFoundation component
Merge branch '2.2'

* 2.2: (30 commits)
  [HttpFoundation] Added support for partial ranges in the BinaryFileResponse.
  [HttpFoundation] Fixed byte ranges in the BinaryFileResponse.
  updated required versions when depending on the HttpFoundation component
  updated required versions when depending on the HttpKernel component
  updated required versions when depending on the Config component
  updated required versions when depending on the Form component
  updated required versions when depending on the DependencyInjection component
  updated required versions when depending on the Validator component
  updated required versions when depending on the Translation component
  updated required versions when depending on the Routing component
  updated required versions when depending on the EventDispatcher component
  updated required versions when depending on the OptionsResolver component
  updated required versions when depending on the PropertyAccess component
  updated required versions when depending on the Security component
  updated required versions when depending on the Templating component
  updated required versions when depending on the Stopwatch component
  updated required versions when depending on the Process component
  updated required versions when depending on the Finder component
  updated required versions when depending on the Dom Crawler component
  use ~2.0 when depending on the Dom Crawler component
  ...
changed dependencies to allow all 2.3 versions of the components (closes #6983)