Removed underscores from test method names to be consistent with other components.

It is more common to use fully camel-cased names for test methods. Only some of the test methods are called with underscore notation. To avoid confusion it is better to be consistent.
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