CRM-12846

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* CRM-12846: API support for toggling components by storing 'enableComponents' config in settings table
  http://issues.civicrm.org/jira/browse/CRM-12846
CRM-12846, settings metadata spec

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* CRM-12846: API support for toggling components by storing 'enableComponents' config in settings table
  http://issues.civicrm.org/jira/browse/CRM-12846
CRM-12846, give preference to settings table

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* CRM-12846: API support for toggling components by storing 'enableComponents' config in settings table
  http://issues.civicrm.org/jira/browse/CRM-12846
Merge pull request #1134 from deepak-srivastava/toggle

CRM-12846