[BrowserKit] Pass headers when `followRedirect()` is called
merged branch stloyd/bugfix/issue7929 (PR #8697)

This PR was merged into the 2.2 branch.

Discussion
----------

[2.2] [BrowserKit] Pass headers when `followRedirect()` is called

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Tests pass?   | yes
| Fixed tickets | #7929
| License       | MIT

Commits
-------

0d07af8 [BrowserKit] Pass headers when `followRedirect()` is called
[BrowserKit] fixed headers when redirecting if history is set to false (refs #8697)
[BrowserKit] removed some headers when redirecting a request
[BrowserKit] fixed method/files/content when redirecting a request
merged branch fabpot/browserkit-redirect-22 (PR #8895)

This PR was merged into the 2.2 branch.

Discussion
----------

[BrowserKit] fixed the redirect behavior according to the RFC

| 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
-------

2d34e78 [BrowserKit] fixed method/files/content when redirecting a request
64e1655 [BrowserKit] removed some headers when redirecting a request
96a4b00 [BrowserKit] fixed headers when redirecting if history is set to false (refs #8697)
Merge branch '2.2' into 2.3

* 2.2:
  [BrowserKit] fixed method/files/content when redirecting a request
  [BrowserKit] removed some headers when redirecting a request
  [BrowserKit] fixed headers when redirecting if history is set to false (refs #8697)
  [BrowserKit] Pass headers when `followRedirect()` is called

Conflicts:
	src/Symfony/Component/BrowserKit/Client.php
	src/Symfony/Component/BrowserKit/Tests/ClientTest.php