Fix wrong method in findTaggedServiceIds(), add example to docblock.
merged branch beberlei/TaggedServices (PR #7909)

This PR was submitted for the master branch but it was merged into the 2.1 branch instead (closes #7909).

Discussion
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[DependencyInjection] Fix method use + example in doc block

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

Fixes using a wrong method in ``findTaggedServiceIds`` and adds an example for the usage and showing the returned data structure as ``@return array`` is not very helpful, the datastructure being a bit unintuitive.

Commits
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ad2c955 [DependencyInjection] Fix wrong method in findTaggedServiceIds(), add example to docblock.
if the repository method returns an array ensure that it's internal poin...
merged branch xabbuh/issue6651 (PR #7906)

This PR was squashed before being merged into the 2.1 branch (closes #7906).

Discussion
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if the repository method returns an array ensure that it's internal poin...

...ter is resetted

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #6651
| License       | MIT
| Doc PR        |

Commits
-------

0610750 if the repository method returns an array ensure that it's internal poin...
[Form] Fixed: String validation groups are never interpreted as callbacks
[Form] Fixed transform()/reverseTransform() to always throw TransformationFailedExceptions
merged branch bschussek/issue7371 (PR #7918)

This PR was merged into the 2.1 branch.

Discussion
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[Form] Fixed: String validation groups are never interpreted as callbacks

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #7371
| License       | MIT
| Doc PR        | -

Commits
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7b2ebbf [Form] Fixed: String validation groups are never interpreted as callbacks
merged branch bschussek/issue7558 (PR #7917)

This PR was merged into the 2.1 branch.

Discussion
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[Form] Fixed transform()/reverseTransform() to always throw TransformationFailedExceptions

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #7558
| License       | MIT
| Doc PR        | -

Commits
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bcb5400 [Form] Fixed transform()/reverseTransform() to always throw TransformationFailedExceptions
[Validator] fixed wrong URL for XSD
added a missing check for the provider key
merged branch fabpot/missing-provider-key-check (PR #7937)

This PR was merged into the 2.1 branch.

Discussion
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added a missing check for the provider key

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

Commits
-------

5b7e1e6 added a missing check for the provider key
added additional tests to cover invalid argument exceptions in OutputFormatterStyle component
Merge branch '2.1' into 2.2

* 2.1:
  added additional tests to cover invalid argument exceptions in OutputFormatterStyle component
  added a missing check for the provider key
  [Validator] fixed wrong URL for XSD
  [Form] Fixed transform()/reverseTransform() to always throw TransformationFailedExceptions
  [Form] Fixed: String validation groups are never interpreted as callbacks
  if the repository method returns an array ensure that it's internal poin...
  Fix wrong method in findTaggedServiceIds(), add example to docblock.

Conflicts:
	src/Symfony/Bridge/Doctrine/Form/DataTransformer/CollectionToArrayTransformer.php
	src/Symfony/Component/Form/Extension/Core/DataTransformer/DataTransformerChain.php
	src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/ArrayToPartsTransformerTest.php
	src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/ChoiceToValueTransformerTest.php
	src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/ChoicesToValuesTransformerTest.php
	src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/DateTimeToArrayTransformerTest.php
	src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/DateTimeToRfc3339TransformerTest.php
	src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/IntegerToLocalizedStringTransformerTest.php
	src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/ValueToDuplicatesTransformerTest.php
[Filesystem] Fix regression introduced in 10dea948
[Process] Cleanup tests & prevent assertion that kills randomly Travis-CI
merged branch stloyd/bugfix/fix_regression (PR #7944)

This PR was merged into the 2.1 branch.

Discussion
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[Filesystem] Fix regression introduced in 10dea94

This is one of ideas to fix the regression from 10dea948, @kachkaev what do you think?

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature? | no
| Tests pass?  | yes
| Fixed tickets | #7920
| License       | MIT

Commits
-------

e4913f8 [Filesystem] Fix regression introduced in 10dea948
merged branch stloyd/bugfix/process_tests (PR #7947)

This PR was merged into the 2.1 branch.

Discussion
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[Process] Cleanup tests & prevent assertion that kills randomly Travis-CI

Commits
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05b987f [Process] Cleanup tests & prevent assertion that kills randomly Travis-CI
fixed CS
updated CHANGELOG for 2.1.10
update CONTRIBUTORS for 2.1.10