assignment rule on data import

[dufoli]

idea is to be able to specify assignment rule on import:
https://developer.salesforce.com/docs/atlas.en-us.api_asynch.meta/api_asynch/create_job.htm

if object type is lead or case :
SELECT Id, Name FROM AssignmentRule WHERE SobjectType = 'Lead' or 'Case'
display list + none

https://developer.salesforce.com/docs/atlas.en-us.api.meta/api/sforce_api_header_assignmentruleheader.htm

let soapHeader = {"AssignmentRuleHeader": {"assignmentRuleId": this.sessionId}}
else simple checkbox
let soapHeader = {"AssignmentRuleHeader": {"useDefaultRule": true}}
add to sfConn.soap(wsdl, importAction, importArgs, soapHeader)
cf
sorenkrabbe/Chrome-Salesforce-inspector#229
sorenkrabbe/Chrome-Salesforce-inspector#171