minor #893 remove security-acl from dependencies (Tobion)

This PR was merged into the 3.0-dev branch.

Discussion
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remove security-acl from dependencies

I guess it was just added in 82658ac to resolve unstable dependecies which should not be required anymore with doctrine/DoctrineCacheBundle#77

Commits
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c54b1a5 remove security-acl from dependencies

Author: fabpot

composer.json

@@ -16,7 +16,6 @@
         "doctrine/orm": "~2.5@dev",
         "doctrine/doctrine-bundle": "~1.6@dev",
         "doctrine/doctrine-cache-bundle": "~1.2@dev",
-        "symfony/security-acl": "~3.0@dev",
         "symfony/swiftmailer-bundle": "~2.3",
         "symfony/monolog-bundle": "~2.8",
         "sensio/distribution-bundle": "~5.0",