bug #16321 Fix the FrameworkBundle dependencies (stof)

This PR was merged into the 2.8 branch.

Discussion
----------

Fix the FrameworkBundle dependencies

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

Due to the new ClassCacheCacheWarmer, the ClassLoader component is now a
required dependency of the bundle.

See the current test failures for component builds (TwigBundle and SecurityBundle tests are triggering fatal errors because of the missing class)

Commits
-------

02584c2 Fix the FrameworkBundle dependencies

src/Symfony/Bundle/FrameworkBundle/composer.json

@@ -18,6 +18,7 @@
     "require": {
         "php": ">=5.3.9",
         "symfony/asset": "~2.7|~3.0.0",
+        "symfony/class-loader": "~2.1|~3.0.0",
         "symfony/dependency-injection": "~2.8",
         "symfony/config": "~2.8",
         "symfony/event-dispatcher": "~2.8|~3.0.0",
@@ -42,7 +43,6 @@
         "symfony/intl": "~2.3|~3.0.0",
         "symfony/security": "~2.6|~3.0.0",
         "symfony/form": "~2.8",
-        "symfony/class-loader": "~2.1|~3.0.0",
         "symfony/expression-language": "~2.6|~3.0.0",
         "symfony/process": "~2.0,>=2.0.5|~3.0.0",
         "symfony/validator": "~2.5|~3.0.0",