minor #11340 [2.3] Add missing development dependencies (romainneutron)

This PR was squashed before being merged into the 2.3 branch (closes #11340).

Discussion
----------

[2.3] Add missing development dependencies

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

I've also added a run of the test suite in every component scope.

Commits
-------

3b02af9 [2.3] Add missing development dependencies

Author: fabpot

composer.json

@@ -21,9 +21,12 @@
         "symfony/http-kernel": "~2.2"
     },
     "require-dev": {
+        "symfony/browser-kit": "~2.3",
+        "symfony/form": "~2.3",
         "symfony/framework-bundle": "~2.2",
         "symfony/twig-bundle": "~2.2",
         "symfony/form": "~2.1",
+        "symfony/process": "~2.0",
         "symfony/validator": "~2.2",
         "symfony/yaml": "~2.0"
     },