CRM-14879: basics for contact fields to display in schedule reminders form

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* CRM-14879: Scheduled reminders for contact date fields
  https://issues.civicrm.org/jira/browse/CRM-14879
CRM-14879: scheduled reminders - add anniversary mode and custom fields for contact

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* CRM-14879: Scheduled reminders for contact date fields
  https://issues.civicrm.org/jira/browse/CRM-14879
CRM-14879: action mapping and option group for contact date field reminders

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* CRM-14879: Scheduled reminders for contact date fields
  https://issues.civicrm.org/jira/browse/CRM-14879
Merge pull request #3517 from agh1/birthday

CRM-14879: Scheduled reminders for contact date fields