Check model versioning options for update and delete

Fix #4 (closed) #5 (closed)

Add model versioning options

disabled: disable versioning

ignoreUpdate : disable versioning on update

ignoreDelete : disable versioning on delete

"versioning": {
    "disabled": false, 
    "ignoreUpdate" : true,
    "ignoreDelete": false
  }

if an option is missing, default value is false.