[Routing] add support for path-relative and scheme-relative URL generation
[Routing] added tests for generating relative paths and network paths
[Routing] made reference type fully BC and improved phpdoc considerably
fix phpdoc of UrlGeneratorInterface that missed some exceptions and improve language of exception message
[Form] Prevent trigger of E_USER_DEPRECATED for new API
[HttpFoundation] Update docblock for non-working method
updated CHANGELOG for 2.0.21
updated VERSION for 2.0.21
bumped Symfony version to 2.0.21-DEV
add preferred_query option to ModelType

This enables the ModelChoiceList to use 'preferred_choices' of the parent ChoiceType.
use preferred_choices in favor of preferred_query
HttpUtils must handle RequestMatcher too
Fixed php doc of GenericEvent::__construct
merged branch lyrixx/fix-eventdispatcher (PR #6487)

This PR was merged into the 2.1 branch.

Commits
-------

abf5e51 [EventDispatcher] Fixed php doc of GenericEvent::__construct

Discussion
----------

[EventDispatcher] Fixed php doc of GenericEvent::__construct

```
Bug fix: yes (doc)
Feature addition: no
Backwards compatibility break: no
Symfony2 tests pass: yes (no modified)
Fixes the following tickets: -
Todo: -
License of the code: MIT
```

---------------------------------------------------------------------------

by drak at 2012-12-26T21:51:54Z

Well spotted.
merged branch havvg/feature/propel1-modelchoice-preferred (PR #6454)

This PR was merged into the 2.1 branch.

Commits
-------

05fca6d use preferred_choices in favor of preferred_query
6855cff add preferred_query option to ModelType

Discussion
----------

[Propel1] add preferred_choices option to ModelType

This enables the ModelChoiceList to use 'preferred_choices' of the parent ChoiceType.

Ping @willdurand

---------------------------------------------------------------------------

by willdurand at 2012-12-22T09:39:39Z

:+1:
[Tests] Fix namespaces
Use KernelEvents constants in TraceableEventDispatcher
merged branch franmomu/fix_test_namespaces (PR #6497)

This PR was merged into the 2.1 branch.

Commits
-------

a6704f3 [Tests] Fix namespaces

Discussion
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[Tests] Fix namespaces
[DependencyInjection] fixed setting a synthetic service on a frozen container
[HttpKernel] refactored logging in the exception listener

 * avoid code duplication
 * allow easier overloading of the default behavior