Initial work allowing certificates to be revoked. (#941)

* Initial work allowing for certificates to be revoked.

lemur/static/app/angular/certificates/services.js

@@ -258,5 +258,9 @@ angular.module('lemur')
       return certificate.customPOST(certificate.exportOptions, 'export');
     };
 
+    CertificateService.revoke = function (certificate) {
+      return certificate.customPUT(certificate.externalId, 'revoke');
+    };
+
     return CertificateService;
   });