[VarDumper] Use Unicode Control Pictures
[VarDumper] inline dump() function loading
[Debug] No gc_collect_cycles(), it's costly and can segfault
[SecurityBundle] Added AuthorizationChecker and TokenStorage to class cache
[DebugBundle] remove README.md
minor #12427 [SecurityBundle] Added AuthorizationChecker and TokenStorage to class cache (iltar)

This PR was merged into the 2.6-dev branch.

Discussion
----------

[SecurityBundle] Added AuthorizationChecker and TokenStorage to class cache

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| Tests pass?   | yes
| License       | MIT

I've added the new `AuthorizationChecker` and `TokenStorage` to the list of classes to compile. The `SecurityContext` was already in there, but the new ones were missing. They are added because if the `SecurityContext` is always loaded, those are always loaded as of `2.6`.

Commits
-------

d238397 [SecurityBundle] Added AuthorizationChecker and TokenStorage to class cache
bug #12411 [VarDumper] Use Unicode Control Pictures (nicolas-grekas)

This PR was merged into the 2.6-dev branch.

Discussion
----------

[VarDumper] Use Unicode Control Pictures

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

I wasn't satisfied with how control chars where dumped, until I found the [Unicode Control Pictures](http://www.unicode.org/charts/PDF/U2400.pdf).
This PR takes advantage of them:

![capture du 2014-11-04 10 52 15](https://cloud.githubusercontent.com/assets/243674/4897678/752fac20-6408-11e4-9186-7b788c9a88bb.png)

Commits
-------

6258ae8 [DebugBundle] remove README.md
50021bd [Debug] No gc_collect_cycles(), it's costly and can segfault
b592e90 [VarDumper] inline dump() function loading
cd076e4 [VarDumper] Use Unicode Control Pictures
[Validator] make DateTime objects represented as strings in the violation message.