Refactor v2 api calls CRM-9794

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* CRM-9794: Remove API v2
  http://issues.civicrm.org/jira/browse/CRM-9794
CRM-12593

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* CRM-12593: CiviCRM Views: "CiviCRM Contacts: Drupal ID" fails for chained relationships. Fix attached.
  http://issues.civicrm.org/jira/browse/CRM-12593
Merge pull request #19 from dlobo/CRM-12593

CRM-12593
CRM-12602

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* CRM-12602: Group Roles module fatal on remove from groups
  http://issues.civicrm.org/jira/browse/CRM-12602
Merge pull request #21 from dlobo/CRM-12602

CRM-12602
Merge remote-tracking branch 'upstream/7.x-4.3' into 7.x-4.3-7.x-master-2013-05-21-00-25-49
Merge pull request #16 from colemanw/v2api

Refactor v2 api calls CRM-9794