DataStore

	API:
		->constructor()
		
		// DATA ADAPTERS MANAGEMENT
		->add_adapter(arg_adapter):boolean
		->remove_adapter(arg_adapter):boolean
		->suspend_adapter(arg_adapter):boolean
		->resume_adapter(arg_adapter):boolean
		
		// DATA COLLECTIONS MANAGEMENT
		->get_collection(arg_model_name):DataCollection - get a data collection for a model.
		->add_collection(arg_collection):boolean - add a data collection.
		->remove_collection(arg_collection):boolean - remove a data collection.

		// WRAPPERS FOR DATA COLLECTIONS OPERATIONS
		->create_record(arg_collection_name, arg_record_id, arg_record_datas):Promise(DataRecord) - create a new data record.
		->delete_record(arg_collection_name, arg_record_id):Promise(boolean) - delete an existing data record.
		->update_record(arg_collection_name, arg_record_id, arg_record_datas):Promise(DataRecord) - update an existing data record.
		->has_record(arg_collection_name, arg_record_id):Promise(boolean) - test if a data record exists with an id.
		
		->find_one_record(arg_collection_name, arg_record_id):Promise(DataRecord) - find an existing data record with an id.
		->find_records(arg_collection_name, arg_query):Promise(DataRecordArray) - find existing data records with a query.
		->find_all_records(arg_collection_name):Promise(DataRecordArray) - find all xisting data records.


	USAGE ON BROWSER:
		var memory_cache = new CacheAdapterNodeCache( {ttl:5000, check_period:2000} )
		var cache_manager = new CacheManager([memory_cache])

		var rest_settings = {...}
		var models_settings = {...}
		var rest_adapter = new DataAdapterRest(rest_settings, models_settings)
		var ds = new DataStore(cache_manager, [rest_adapter])
		ds.set_tenant('my tenant')
		ds.set_credentials('*', app.get_credentials())
		ds.set_credentials('cars', {token:'...'} )
		
		var cars = ds.get_collection('cars')
		var car_12 = cars.find_one_record('12')

		or

		var car_13 = ds.find_one_record('cars', '13')
		
		var car_14 = ds.create_record('cars', '14', { engine:'gazol', color:'red' } )
Each application on the browser has credentials for one tenant.