Doctrine and supporting libraries

The Doctrine.php entry point returns a working EntityManager, that's
all for now.

The libraries were downloaded using
Composer version ae3b7ad5c07d1df35cf4c2dcba20fed329cf82b0 2013-11-29 09:28:48

Libraries are at the following versions:

doctrine/annotations v1.1.2
doctrine/cache v1.3.0
doctrine/collections v1.1
doctrine/common v2.4.1
doctrine/dbal v2.4.1
doctrine/inflector v1.0
doctrine/lexer v1.0
doctrine/orm v2.4.1
symfony/console v2.3.7

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* CRM-13871: Provide an ORM layer: Doctrine
  http://issues.civicrm.org/jira/browse/CRM-13871