updated VENDORS for 2.6.0-BETA2
fixed Symfony version dep
feature #728 Added a new AppBundle to comply with Symfony Best Practices (javiereguiluz)

This PR was squashed before being merged into the 3.0-dev branch (closes #728).

Discussion
----------

Added a new AppBundle to comply with Symfony Best Practices

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #671
| License       | MIT
| Doc PR        | -

Symfony Best Practices recommend to start developing your applications with a single AppBundle bundle. This PR allows to include that AppBundle in the Symfony Standard Edition, to make it easier for developers.

I used the same skeleton as for the `generate:bundle` command, but I thought that it would be better to simplify it and remove the `$name` route parameter and use just a static template without parameters.

Commits
-------

45da0d0 Added a new AppBundle to comply with Symfony Best Practices
Merge branch '2.3' into 2.5

* 2.3:
  feature #728 Added a new AppBundle to comply with Symfony Best Practices (javiereguiluz)
Merge branch '2.5' into 2.6

* 2.5:
  feature #728 Added a new AppBundle to comply with Symfony Best Practices (javiereguiluz)
Merge branch '2.6' into 2.7

* 2.6:
  feature #728 Added a new AppBundle to comply with Symfony Best Practices (javiereguiluz)
  fixed Symfony version dep
  updated VENDORS for 2.6.0-BETA2

Conflicts:
	composer.json
Merge branch '2.7'

* 2.7:
  feature #728 Added a new AppBundle to comply with Symfony Best Practices (javiereguiluz)
  fixed Symfony version dep
  updated VENDORS for 2.6.0-BETA2
updated VENDORS for 2.5.8
Fixed SensioDistributionBundle requirements

The 3.0.12 version introduces the `removeSymfonyStandardFiles` method
in `Sensio\Bundle\DistributionBundle\Composer\ScriptHandler` which
is required for the `post-install` and `post-update` scripts.

When the cURL PHP extension is not installed, Composer will install
the 3.0.11 version of SensioDistributionBundle which don't depends on cURL,
but the scripts requiring the `removeSymfonyStandardFiles` method will
fail.

By requiring at least the 3.0.12 version, we ensure Composer will
abort with an helpful error, saying that `ext-curl` needs to be
installed.

Before:

> Method Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::removeSymfonyStandardFiles is not callable, can not call post-install-cmd script

After:

> Your requirements could not be resolved to an installable set of packages.
>
> Problem 1
>     - sensiolabs/security-checker v2.0.0 requires ext-curl * -> the requested PHP extension curl is missing from your system.
>     - sensio/distribution-bundle v3.0.12 requires sensiolabs/security-checker ~2.0 -> satisfiable by sensiolabs/security-checker[v2.0.0].
>     - Installation request for sensio/distribution-bundle ~3.0.12 -> satisfiable by sensio/distribution-bundle[v3.0.12].
minor #749 Fixed SensioDistributionBundle requirements (valeriangalliat)

This PR was submitted for the master branch but it was merged into the 2.5 branch instead (closes #749).

Discussion
----------

Fixed SensioDistributionBundle requirements

The 3.0.12 version introduces the `removeSymfonyStandardFiles` method in `Sensio\Bundle\DistributionBundle\Composer\ScriptHandler` which is required for the `post-install` and `post-update` scripts.

When the cURL PHP extension is not installed, Composer will install the 3.0.11 version of SensioDistributionBundle which don't depends on cURL, but the scripts requiring the `removeSymfonyStandardFiles` method will fail.

By requiring at least the 3.0.12 version, we ensure Composer will abort with an helpful error, saying that `ext-curl` needs to be installed.

Before:

    Method Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::removeSymfonyStandardFiles is not callable, can not call post-install-cmd script

After:

    Your requirements could not be resolved to an installable set of packages.

    Problem 1
        - sensiolabs/security-checker v2.0.0 requires ext-curl * -> the requested PHP extension curl is missing from your system.
        - sensio/distribution-bundle v3.0.12 requires sensiolabs/security-checker ~2.0 -> satisfiable by sensiolabs/security-checker[v2.0.0].
        - Installation request for sensio/distribution-bundle ~3.0.12 -> satisfiable by sensio/distribution-bundle[v3.0.12].

Commits
-------

90c196e Fixed SensioDistributionBundle requirements
Merge branch '2.5' into 2.6

* 2.5:
  Fixed SensioDistributionBundle requirements
  updated VENDORS for 2.5.8
Mergtpe branch '2.6' into 2.7

* 2.6:
  Fixed SensioDistributionBundle requirements
  updated VENDORS for 2.5.8
Merge branch '2.7'

* 2.7:
  Fixed SensioDistributionBundle requirements
  updated VENDORS for 2.5.8
Removing installation instructions

We have this multiple other places
minor #751 Removing installation instructions (weaverryan)

This PR was merged into the 2.3 branch.

Discussion
----------

Removing installation instructions

Hey guys!

We have the installation instructions in too many places. Ultimately, as we get the new symfony.com/download page and the downloader, this will reduce to just *one* spot (likely the download page, with a hand-off to continue by reading the docs).

On this repo, we should have no installation docs - it should just point to the central place. I also think we can just link to the current version of all of the docs for the bundle.

Thanks!

Commits
-------

22589ce Removing installation instructions
changed version to 2.3 in the README
Merge branch '2.3' into 2.5

* 2.3:
  changed version to 2.3 in the README
  Removing installation instructions

Conflicts:
	README.md
Merge branch '2.5' into 2.6

* 2.5:
  changed version to 2.3 in the README
  Removing installation instructions

Conflicts:
	README.md
Merge branch '2.6' into 2.7

* 2.6:
  changed version to 2.3 in the README
  Removing installation instructions
updated VERSION in README