Breaking changes from ML.NET v0.8 to v0.9 impacting ML.NET Samples

There are many more breaking changes in 0.9, but these are the ones that mostly the ML.NET samples faced when moving to v0.9:

	1. MakePredictionFunction() --> CreatePredictionEngine() --> Based on my original feedback and this [issue](https://github.com/dotnet/machinelearning/issues/1761), since it creates an object, not a function..
	
	2. The type or namespace name 'Microsoft.ML.Runtime' does not exist in the namespace 'Microsoft.ML' (Error: are you missing an assembly reference?)
		a. Data attributes are now in: using Microsoft.ML.Data; 
		b. TextLoader and other types moved to using Microsoft.ML.Data;
		c. Related, removed:
			using Microsoft.ML.Runtime.Learners;
			using Microsoft.ML.Runtime.Data;
			
	3. mlContext.Data.TextReader --> mlContext.Data.CreateTextReader()
	4.  
	5. RegressionEvaluator.Result -> Microsoft.ML.Data.RegressionMetrics
	6. BinaryClassifierEvaluator.Result --> Type is now Microsoft.ML.Data.CalibratedBinaryClassificationMetrics
	7. MultiClassClassifierEvaluator.Metrics --> Type is now Microsoft.ML.Data.MultiClassClassifierMetrics
ClusteringEvaluator.Result --> Type is now ClusteringMetrics