[Process] Add validation on Process input
[Debug] cleanup interfaces before 2.5-final
[PropertyAccess] Refactored PropertyAccessorTest
[PropertyAccess] Refactored PropertyAccessorCollectionTest
[PropertyAccess] Fixed getValue() when accessing non-existing indices of ArrayAccess implementations
Fixed the Travis build to avoid exiting too early
minor #10950 Fixed the Travis build to avoid exiting too early (stof)

This PR was squashed before being merged into the 2.3 branch (closes #10950).

Discussion
----------

Fixed the Travis build to avoid exiting too early

currently, failed tests on Travis are exiting the build too early, avoiding to run some tests and maybe even loosing some output. See https://github.com/travis-ci/travis-ci/issues/2346 for more details

Commits
-------

2e64fb1 Fixed the Travis build to avoid exiting too early
Fixed test cases failing when the Intl extension is not installed
bug #10947 [2.4][PropertyAccess] Fixed getValue() when accessing non-existing indices of ArrayAccess implementations (webmozart)

This PR was merged into the 2.4 branch.

Discussion
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[2.4][PropertyAccess] Fixed getValue() when accessing non-existing indices of ArrayAccess implementations

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

This PR backports two test refactoring commits from the master branch. The third commit is basically the same as #10946.

Commits
-------

5b5a6b6 [PropertyAccess] Fixed getValue() when accessing non-existing indices of ArrayAccess implementations
91ee821 [PropertyAccess] Refactored PropertyAccessorCollectionTest
5614303 [PropertyAccess] Refactored PropertyAccessorTest
[PropertyAccess] fixed CS
minor #10955 Fixed test cases failing when the Intl extension is not installed (webmozart)

This PR was merged into the 2.3 branch.

Discussion
----------

Fixed test cases failing when the Intl extension is not installed

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

I tested the 2.3 branch against PHP 5.5.12 with the following ICU versions:

* none
* 4.0
* 4.2
* 4.4
* 4.6
* 4.8
* 49
* 50
* 51
* 52
* 53

This PR contains the related fixes.

Commits
-------

fad38e8 Fixed test cases failing when the Intl extension is not installed
[Debug] better ouf of memory error handling
feature #10941 [Debug] cleanup interfaces before 2.5-final (nicolas-grekas)

This PR was merged into the 2.4-dev branch.

Discussion
----------

[Debug] cleanup interfaces before 2.5-final

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

This PR is targeted at cleaning up interfaces before 2.5 final:
- ExceptionHandlerInterface has never been released in a stable Symfony, lets drop it, not deprecate it,
- generalize a little bit how fatal errors are handled and make them take the same path as uncaught exceptions,
- enhance handling of out of memory situations.

Commits
-------

e3255bf [Debug] better ouf of memory error handling
dfa8ff8 [Debug] cleanup interfaces before 2.5-final
[HttpKernel] fixed file uploads in functional tests when no file was selected

Allow user to submit a form with no file selected.
bug #10953 [HttpKernel] fixed file uploads in functional tests without file selected (realmfoo)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #10953).

Discussion
----------

[HttpKernel] fixed file uploads in functional tests without file selected

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

Commits
-------

6f56d87 [HttpKernel] fixed file uploads in functional tests when no file was selected
[PropertyAccess] Fixed inverted logic
[PropertyAccess] Fixed getValue() when accessing non-existing indices of ArrayAccess implementations
[DomCrawler] Added more tests for the XPath filtering

This will ensure we don't introduce regressions again when fixing #10206.
[DomCrawler] Fixed filterXPath() chaining
Fixed the XPath filtering to have the same behavior than Symfony 2.4