CRM-13938, now we can generate basic entities for doctrine

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* CRM-13938: Create Annotations for entity files
  http://issues.civicrm.org/jira/browse/CRM-13938
CRM-13938, added table info

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* CRM-13938: Create Annotations for entity files
  http://issues.civicrm.org/jira/browse/CRM-13938
CRM-13938, add fk / join annotation

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* CRM-13938: Create Annotations for entity files
  http://issues.civicrm.org/jira/browse/CRM-13938
by default set entity generation to false CRM-13938

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* CRM-13938: Create Annotations for entity files
  http://issues.civicrm.org/jira/browse/CRM-13938
Merge pull request #2217 from kurund/CRM-13938

CRM-13938, modify gencode to generate entities