CRM-14281 call hook_civicrm_config() in loadbootstrap()

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* CRM-14281: hook_civicrm_config does not get called when using Joomla bootstrap
  http://issues.civicrm.org/jira/browse/CRM-14281
Merge pull request #2583 from northwind2/CRM-14281

CRM-14281 call hook_civicrm_config() in loadbootstrap()