adds support for PTY mode
adds convenience method mustRun
attempts to fix tests on Travis
adds cache for isPtySupported()
[Routing] add missing unit tests for Route and RouteCollection classes
minor #9925 [Routing] add missing unit tests for Route and RouteCollection classes (FlorianLB)

This PR was squashed before being merged into the 2.3 branch (closes #9925).

Discussion
----------

[Routing] add missing unit tests for Route and RouteCollection classes

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | none
| License       | MIT
| Doc PR        | none

Just add few unit tests in Route and RouteCollection classes to have a full coverage.

Commits
-------

7bbd568 [Routing] add missing unit tests for Route and RouteCollection classes
[HttpFoundation] Documented public properties.
[Propel1Bridge][ModelChoiceList] add exception message for invalid classes
minor #9928 [HttpFoundation] Documented public properties (jakzal)

This PR was merged into the 2.3 branch.

Discussion
----------

[HttpFoundation] Documented public properties

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #9670
| License       | MIT
| Doc PR        | -

`$request` and `$query` parameter bags could be hard to get for a newcommer, who's used to `$_POST` and `$_GET` variables. Some people claim naming makes no sense (see #9671).

For consistency I documented all public properties.

Commits
-------

1b79831 [HttpFoundation] Documented public properties.
Fix hardcoded listenerTag name in error message
bug #9940 [EventDispatcher] Fix hardcoded listenerTag name in error message (lemoinem)

This PR was submitted for the 2.3-dev branch but it was merged into the 2.3 branch instead (closes #9940).

Discussion
----------

[EventDispatcher] Fix hardcoded listenerTag name in error message

| Q             | A
| ------------- | ---
| Fixed tickets | N/A
| License       | MIT

Just as the title say, there was a kernel.event_listener string hardcoded in an error message although everywhere else in this class it is stored in the `$listenerTag` property.

Commits
-------

8c91537 [EventDispatcher] Fix hardcoded listenerTag name in error message
Add support SAPI cli-server
bug #9938 [Process] Add support SAPI cli-server (peter-gribanov)

This PR was submitted for the 2.3-dev branch but it was merged into the 2.3 branch instead (closes #9938).

Discussion
----------

[Process] Add support SAPI cli-server

As of PHP 5.4.0, the CLI SAPI provides a built-in web server.
```php
PHP_SAPI == 'cli-server'
```
PHP can be used portable without installation on PC. For example, the [assembly](http://windows.php.net/download/) does not require installation in the system on Windows. In this case `PHP_BINARY` contains the path to the PHP executor, and all the other search methods will not return result.

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

Commits
-------

92d8323 Add support SAPI cli-server
updated CHANGELOG for 2.3.9
update CONTRIBUTORS for 2.3.9
updated VERSION for 2.3.9
bumped Symfony version to 2.3.10
Merge branch '2.3' into 2.4

* 2.3:
  bumped Symfony version to 2.3.10
  updated VERSION for 2.3.9
  update CONTRIBUTORS for 2.3.9
  updated CHANGELOG for 2.3.9
  Add support SAPI cli-server
  Fix hardcoded listenerTag name in error message
  [HttpFoundation] Documented public properties.
  [Routing] add missing unit tests for Route and RouteCollection classes

Conflicts:
	src/Symfony/Component/HttpKernel/Kernel.php
	src/Symfony/Component/Routing/Tests/RouteCollectionTest.php
updated CHANGELOG for 2.4.1
updated VERSION for 2.4.1