Changes the form icon in the toolbar to be pixel perfect.
minor #9689 [Form] Improved debugger icon (sukei)

This PR was merged into the 2.4 branch.

Discussion
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[Form] Improved debugger icon

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

Changes the form icon in the toolbar to be pixel perfect.

| before                                                                                               | after                                                                                               |
| ---------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------- |
| ![before](https://f.cloud.github.com/assets/890645/1558707/8c4e2d42-4fa4-11e3-9397-376f761869a2.png) | ![after](https://f.cloud.github.com/assets/890645/1558708/90257844-4fa4-11e3-8a83-73d163d47261.png) |

Commits
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74e59fe Changes the form icon in the toolbar to be pixel perfect.
Merge branch '2.4'

* 2.4: (44 commits)
  [FrameworkBundle] Add missing license headers
  Fix parent serialization of user object
  [DependencyInjection] fixed typo
  added condition to avoid skipping tests on JSON_PRETTY support
  add memcache, memcached, and mongodb extensions to run skipped tests
  [DependencyInjection] Fixed support for backslashes in service ids.
  fix #9356 [Security] Logger should manipulate the user reloaded from provider
  [FrameworkBundle] Added extra details in XMLDescriptor to improve container description
  fixed CS
  Crawler default namespace fix
  [BrowserKit] fixes #8311 CookieJar is totally ignorant of RFC 6265 edge cases
  [HttpFoundation] fixed constants that do exist in 2.3 (only in 2.4)
  fix 5528 let ArrayNode::normalizeValue respect order of value array provided
  fix #7243 allow 0 as arraynode name
  Fixed issue in BaseDateTimeTransformer when invalid timezone cause Transformation filed exception (closes #9403).
  BinaryFileResponse should also return 416 or 200 on some range-requets
  fix deprecated usage and clarify constructor defaults for number formatter
  Bumping dependency to ProxyManager to allow testing against the new 0.5.x branch changes
  Do normalization on tag options
  bumped Symfony version to 2.3.9
  ...