CRM-12923 - Move $.fn.crmContactField to core

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* CRM-12923: Create HTML prototype of "Job Position" UI
  http://issues.civicrm.org/jira/browse/CRM-12923
CRM-12923 - Move $.fn.crmContactField from rest.js to jquery.crmContactField.js

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* CRM-12923: Create HTML prototype of "Job Position" UI
  http://issues.civicrm.org/jira/browse/CRM-12923
Merge pull request #1172 from totten/master-crmContactField-widget

CRM-12923 - Move $.fn.crmContactField to core