Add datasource and model setting `normalizeUndefinedInQuery`
to determine how it will handle undefined values. Options:
- nullify : converts undefined to null
- throw : throw an error on undefined value
- ignore : strip the key where undefined value is found
The default operation is to strip the key.
* Fix id comparision in tests so that they work with mongodb object id (Raymond Feng)
* Update validations.js (Rand McKinney)
* Add support for using UUID V4 as defaultFn (Bram Borggreve)
* primaryKey for hasMany and belongsTo relations (sklyukin)
* primaryKey to hasOne relation (sklyukin)
* Add direct copmarison value for array matching (Laurent Villeneuve)
* Add support for matching array values à la mongo. (Laurent Villeneuve)
* Fixed ReferencesMany .findById to check the given id in the ids array of the model instance (Satyadeep)
If the PK has a definition like
```
"mysql": {
"dataType": "CHAR",
"dataLength":36,
"nullable":"N"
}
```
dataLength is ignored when the PK is used as a foreignKey in other models
* Support embedded query in memory connector. Fix memory connector bug (Laurent Villeneuve)
* Use idEquals when comparing ids in relation definitions (Laurent Villeneuve)
* Handle possible undefined id (Laurent Villeneuve)
* Fix id copmarison by using strings (Laurent Villeneuve)
* Refactor idEquals to utils (Raymond Feng)
Adds support for the ability to query embedsMany models from the parent.
Fix a memory connector bug that could occur when having an "or" or "and"
clause combined with another property. In that case, the and would revert
true for 'Paul McCartney'
```
{name:'John Lennon',and: [{role:'lead'}, {vip:true}]}}
```
* Do not coerce RegExp objects to strings (Simon Ho)
* Indicate result of destroyById/protototype.destroy (Fabien Franzen)
* Removed extra ")" (Chris Finn)
* Fixed typo & added the filter units (Chris Finn)
Return `info.count` to the callback to indicate whether the model
instance was deleted or not. When Model's `settings.strictDelete`
is true, return 404 error when the model instance was not found.