CRM-16189, added function to validate financial type (#8570)

CRM-16189, added function to validate financial type (#8570)

* CRM-16189, added function to validate financial type

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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 ValidateFinancialType

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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, fixed stylings

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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, updated code and removed unwanted checks

* 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

* --CRM-16189, fixed array indentation

* --CRM-16189, removed conflicts

* --CRM-16189, fixed return value to use it as bool