adds support for PTY mode
adds convenience method mustRun
attempts to fix tests on Travis
adds cache for isPtySupported()
Add type detection. Needed by pdo_dblib
bug #9747 [DoctrineBridge] Fix: Add type detection. Needed by pdo_dblib (iamluc)

This PR was submitted for the 2.3-dev branch but it was merged into the 2.3 branch instead (closes #9747).

Discussion
----------

[DoctrineBridge] Fix: Add type detection. Needed by pdo_dblib

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

Commits
-------

75f5cc3 Add type detection. Needed by pdo_dblib
[CssSelector] fixed numeric attribute issue
bug #9970 [CssSelector] fixed numeric attribute issue (jfsimon)

This PR was merged into the 2.3 branch.

Discussion
----------

[CssSelector] fixed numeric attribute issue

This PR adds a cast from number to string when parsing a numeric attribute value.

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #9968

Commits
-------

613535a [CssSelector] fixed numeric attribute issue
[TwigBridge] Update min. version of Twig

The minimal version of Twig must be 1.12 because of usage the method `Twig_SimpleFunction` that was added in that version.
bug #9983 [TwigBridge] Update min. version of Twig (stloyd)

This PR was merged into the 2.3 branch.

Discussion
----------

[TwigBridge] Update min. version of Twig

| Q             | A
| ------------- | ---
| Bug fix?      | kinda
| New feature?  | no
| BC breaks?    | no
| Tests pass?   | yes
| License       | MIT

The minimal version of Twig must be 1.12 because of usage the method `Twig_SimpleFunction` that was added in that version.

Commits
-------

c003291 [TwigBridge] Update min. version of Twig
Prevent WDT from creating a session
Fix for null values in assosiated properties when using UniqueEntityValidator
bug #9979 [Doctrine Bridge][Validator] Fix for null values in assosiated properties when using UniqueEntityValidator (vpetrovych)

This PR was submitted for the 2.3-dev branch but it was merged into the 2.3 branch instead (closes #9979).

Discussion
----------

[Doctrine Bridge][Validator] Fix for null values in assosiated properties when using UniqueEntityValidator

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #7382
| License       | MIT
| Doc PR        |

This fixes issue with UniqueEntityValidator when ignoreNull = false and associated property contains null value:
```
Warning: ReflectionProperty::getValue() expects parameter 1 to be object, null given in [...]/symfony2/vendor/doctrine/orm/lib/Doctrine/ORM/Mapping/ClassMetadataInfo.php line 670
```

Here's what docs say about ignoreNull:

> If this option is set to true, then the constraint will allow multiple entities to have a null value for a field without failing validation. If set to false, only one null value is allowed - if a second entity also has a null value, validation would fail.

Commits
-------

bf368bc [Doctrine Bridge][Validator] Fix for null values in assosiated properties when using UniqueEntityValidator
Fix for a couple of undefined classes in docblocks
minor #9991 Fix for a couple of undefined classes in docblocks (dave1010)

This PR was submitted for the 2.3-dev branch but it was merged into the 2.3 branch instead (closes #9991).

Discussion
----------

Fix for a couple of undefined classes in docblocks

These are the 2 that I've come across, but there may be some more.

Commits
-------

3918d6d Fix for a couple of undefined classes in docblocks
Fixed the Travis setup for HHVM
minor #9999 Fixed the Travis setup for HHVM (stof)

This PR was squashed before being merged into the 2.3 branch (closes #9999).

Discussion
----------

Fixed the Travis setup for HHVM

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

this replaces #9997 with a proper fix: fixing the cause of the issue instead of adding workarounds for it

"php -r" does not seem to behave properly in HHVM, so the check to detect HHVM has been switch to a check on the environment variable set by Travis.

Commits
-------

67d4959 Fixed the Travis setup for HHVM
[Console] Fixed the compatibility with HHVM
bug #10000 [Console] Fixed the compatibility with HHVM (stof)

This PR was squashed before being merged into the 2.3 branch (closes #10000).

Discussion
----------

[Console] Fixed the compatibility with HHVM

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

The only failures in the Console testsuite were due to facebook/hhvm#1327, and a workaround for this issue is easy.

This PR currently includes #9999 in it, to have a working HHVM build on Travis.

Commits
-------

ac1ba81 [Console] Fixed the compatibility with HHVM
[Twig Bridge] Fixed bug in ExpressionExtension