[Console] added a better way to ask questions to the user
[Console] Add docblocks and unit tests to QuestionHelper
[DependencyInjection] Use DOM instead of SimpleXML for namespace support
[DependencyInjection] Deprecate SimpleXMLElement
feature #10606 [Console] added a better way to ask questions to the user (fabpot, romainneutron)

This PR was merged into the 2.5-dev branch.

Discussion
----------

[Console] added a better way to ask questions to the user

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | yes
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | not yet

This PR replaces #9811

- [x] add missing phpdocs
- [x] add unit tests
- [ ] submit doc PR

Commits
-------

336bba2 [Console] Add docblocks and unit tests to QuestionHelper
c413f89 [Console] added a better way to ask questions to the user
feature #10619 [DependencyInjection] Use DOM instead of SimpleXML for namespace support (sandermarechal, romainneutron)

This PR was merged into the 2.5-dev branch.

Discussion
----------

[DependencyInjection] Use DOM instead of SimpleXML for namespace support

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | yes
| Tests pass?   | yes
| Fixed tickets | #9345
| License       | MIT

This PR replaces #9350

Commits
-------

a3c60c8 [DependencyInjection] Deprecate SimpleXMLElement
33c91f9 [DependencyInjection] Use DOM instead of SimpleXML for namespace support
Fix travis build