Truly disabled profiler in prod
[FrameworkBundle] added a way to disable the profiler

Before:

  enabled: true  # the profiler is enabled and data are collected

  enabled: false # the profiler is enabled but data are not collected (data can be collected on demand)

  No way to disable the profiler

After:

  enabled: true  # the profiler is enabled and data are collected
  collect: true

  enabled: true  # the profiler is enabled but data are not collected (data can be collected on demand)
  collect: false

  enabled: false # the profiler is disabled
fixed the registration of the web profiler when the profiler is disabled
merged branch fabpot/profiler-activation (PR #7859)

This PR was merged into the master branch.

Discussion
----------

Profiler activation

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | yes
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #7064, #7071
| License       | MIT
| Doc PR        | symfony/symfony-docs#2565

As stated in #7071, there is no way to disable the profiler completely. Even when the `enabled` flag is set to `false`, the profiler is still registered but the data collectors are not activated.

Now, when `enabled` is `false`, the profiler is disabled. To get the old `false` behavior, you now need to set `enabled` to `true` and set the new `collect` flag to `false`.

Todo:

 - [x] update docs
 - [x] update Symfony SE -- not needed

Commits
-------

88ebd62 fixed the registration of the web profiler when the profiler is disabled
a11f901 [FrameworkBundle] added a way to disable the profiler
f675dd8 Truly disabled profiler in prod
Place hasArgument() check at the beginning of getArgument() method 

If input definition doesn't have specified argument, then unnecessary operations will be executed ($arguments = is_int($name) ? array_values($this->arguments) : $this->arguments;)
Fix http-kernel dep in symfony/security

The current constraint will not match 2.3.x-dev and cause edge cases
where either:

* composer falls back to symfony/symfony because it cannot find a match
* composer installs 2.2 versions of http-kernel and http-foundation
Added missing information to the UPGRADE-3.0 file and sorted its sections
[Validator] Rename issn constraint message option to be consistent with all constraints having a single message option
merged branch ajgarlag/feature/issn-validator-message-option (PR #7872)

This PR was merged into the master branch.

Discussion
----------

[Validator] Rename issn constraint message option.

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

Rename issn constraint message option to be consistent with all constraints having a single message option as suggested by @stof at https://github.com/symfony/symfony/commit/a4abfb95509437153bee13f1a49ae74a63408806#L0R23

Commits
-------

57c724a [Validator] Rename issn constraint message option to be consistent with all constraints having a single message option
merged branch alexpods/patch-1 (PR #7864)

This PR was merged into the master branch.

Discussion
----------

Place hasArgument() check at the beginning of getArgument() method

If input definition doesn't have specified argument, then unnecessary operations will be executed ($arguments = is_int($name) ? array_values($this->arguments) : $this->arguments;)

Commits
-------

992c218 Place hasArgument() check at the beginning of getArgument() method
merged branch bschussek/doc-fix (PR #7867)

This PR was merged into the master branch.

Discussion
----------

Added missing information to the UPGRADE-3.0 file and sorted its sections

Commits
-------

7e7e4c0 Added missing information to the UPGRADE-3.0 file and sorted its sections
merged branch igorw/security-constraint (PR #7866)

This PR was merged into the master branch.

Discussion
----------

Fix http-kernel dep in symfony/security

The current constraint will not match 2.3.x-dev and cause edge cases
where either:

* composer falls back to symfony/symfony because it cannot find a match
* composer installs 2.2 versions of http-kernel and http-foundation

Commits
-------

01016be Fix http-kernel dep in symfony/security
[SecurityBundle] fixed deps on the security component