CRM-16189, added function to check if financial type has Deferred Inc… (#8565)

CRM-16189, added function to check if financial type has Deferred Inc… (#8565)

* CRM-16189, added function to check if financial type has Deferred Income Account is relationship

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

Conflicts:

	CRM/Financial/BAO/FinancialAccount.php

* CRM-16189 Added unit test for checkForValidFinancialType function

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

Conflicts:

	tests/phpunit/CRM/Financial/BAO/FinancialAccountTest.php

* CRM-16189, changed the function name

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

* CRM-16189, updated class name

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