Remove v2 api CRM-9794

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

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

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* CRM-9794:
  http://issues.civicrm.org/jira/browse/CRM-9794
Remove ICIRR module CRM-9794

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* CRM-9794:
  http://issues.civicrm.org/jira/browse/CRM-9794
Remove NYSS module CRM-9794

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* CRM-9794:
  http://issues.civicrm.org/jira/browse/CRM-9794
Merge pull request #594 from colemanw/v2api

Remove ApiV2 and other cruft