[ready-for-core-team-review]CRM-16189, added code to add recognition date on contribu...

[ready-for-core-team-review]CRM-16189, added code to add recognition date on contribution form (#8588)

* CRM-16189, added code to add recognition date on contribution form

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* CRM-16189: Improve support for Accrual Method bookkeeping
  https://issues.civicrm.org/jira/browse/CRM-16189

* CRM-16189, added webtest

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* CRM-16189: Improve support for Accrual Method bookkeeping
  https://issues.civicrm.org/jira/browse/CRM-16189

* --CRM-16189, changed the field from date picker to drop down and added validation rule

* --CRM-16189, updated function class

* CRM-16189, added Revenue recognition date on COntribution View form

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* CRM-16189: Improve support for Accrual Method bookkeeping
  https://issues.civicrm.org/jira/browse/CRM-16189