Rename CRM_Import -> CRM_Contact_Import CRM-11254

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* CRM-11254: Create parent class for import
  http://issues.civicrm.org/jira/browse/CRM-11254

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* CRM-11254:
  http://issues.civicrm.org/jira/browse/CRM-11254
* CRM-11254::
  http://issues.civicrm.org/jira/browse/CRM-11254:
Merge pull request #870 from colemanw/import

Rename CRM_Import -> CRM_Contact_Import CRM-11254