CRM-14201, converted contact relationship listing to ajax/datatable listing

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* CRM-14201: Contact Relationships tab needs pagination
  http://issues.civicrm.org/jira/browse/CRM-14201
fixed enable/disable actions, CRM-14201

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* CRM-14201: Contact Relationships tab needs pagination
  http://issues.civicrm.org/jira/browse/CRM-14201
refresh all datatables on the page during enable/disable action CRM-14201

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* CRM-14201: Contact Relationships tab needs pagination
  http://issues.civicrm.org/jira/browse/CRM-14201
added relationship selector on user dashboard CRM-14201

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* CRM-14201: Contact Relationships tab needs pagination
  http://issues.civicrm.org/jira/browse/CRM-14201
zero record text fixes CRM-14201

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* CRM-14201:
  http://issues.civicrm.org/jira/browse/CRM-14201
zero record text fixes CRM-14201

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* CRM-14201: Contact Relationships tab needs pagination
  http://issues.civicrm.org/jira/browse/CRM-14201
no need to block and unblock, CRM-14201

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* CRM-14201: Contact Relationships tab needs pagination
  http://issues.civicrm.org/jira/browse/CRM-14201
fixed enable action for past relationships CRM-14201

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* CRM-14201: Contact Relationships tab needs pagination
  http://issues.civicrm.org/jira/browse/CRM-14201
code cleanup, CRM-14201

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* CRM-14201: Contact Relationships tab needs pagination
  http://issues.civicrm.org/jira/browse/CRM-14201
Merge pull request #2591 from kurund/CRM-14201

CRM-14201, implement pager for contact relationship listing