Fix for CRM-14840: Record reminder sent activity on case when the source activity is case activity

Conflicts:
	CRM/Core/BAO/ActionSchedule.php

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* CRM-14840: File schedule reminder on case
  https://issues.civicrm.org/jira/browse/CRM-14840
Regression Fix
CRM-14840 - minor fix for handling CiviCase Component

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* CRM-14840: File schedule reminder on case
  https://issues.civicrm.org/jira/browse/CRM-14840
QA Fix
Merge pull request #4654 from atif-shaikh/CRM-14840-fix

Crm 14840 fix