removed whitespaces
PoFileDumper - PO headers
bug #9223 [Translator] PoFileDumper - PO headers (Padam87)

This PR was submitted for the master branch but it was merged into the 2.2 branch instead (closes #9223).

Discussion
----------

[Translator] PoFileDumper - PO headers

| Q             | A
| -------------  | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #6765 - partially
| License       | MIT
| Doc PR        |

Po files should not be dumped without a header. It causes a lot of problems, including charset issues.

See #6765 / 1 for more info

Commits
-------

e93bc50 [Translator] PoFileDumper - PO headers
assets:install command should mirror .dotfiles (.htaccess)
bug #9237 [FrameworkBundle] assets:install command should mirror .dotfiles (.htaccess) (FineWolf)

This PR was submitted for the master branch but it was merged into the 2.2 branch instead (closes #9237).

Discussion
----------

[FrameworkBundle] assets:install command should mirror .dotfiles (.htaccess)

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

The `assets:install` command currently ignores all *.dotfiles* when mirroring the `Resources\public` folders of bundles. This can lead to issues when *.htaccess* files are required for some public assets (ie.: CORS headers for font files to be served via Cloudfront).

Since the assets being installed are clearly in a folder called `public`, we can safely assume that those files are in fact supposed to be accessible and copy them over with the normal files.

Commits
-------

9c884a0 [FrameworkBundle] assets:install command should mirror .dotfiles (.htaccess)
[Security] limited the password length passed to encoders
updated CHANGELOG for 2.2.9
update CONTRIBUTORS for 2.2.9
updated VERSION for 2.2.9
bumped Symfony version to 2.2.10
Merge branch '2.2' into 2.3

* 2.2:
  bumped Symfony version to 2.2.10
  updated VERSION for 2.2.9
  update CONTRIBUTORS for 2.2.9
  updated CHANGELOG for 2.2.9
  [Security] limited the password length passed to encoders
  assets:install command should mirror .dotfiles (.htaccess)
  PoFileDumper - PO headers
  removed whitespaces

Conflicts:
	src/Symfony/Component/HttpKernel/Kernel.php
	src/Symfony/Component/Security/Core/Encoder/BCryptPasswordEncoder.php
updated CHANGELOG for 2.3.6
updated VERSION for 2.3.6
bumped Symfony version to 2.3.7