[AddVectorObs] Made it possible to call AddVectorObs with non floats (#398)

* [AddVectorObs] Made it possible to call AddVectorObs with int, Vector2, Vector3, List<float> and float[].

* [Comments] Made the comment clearer after overloading

* [Fix] Use AddRange instead of Add when adding lists or floatarrays

unity-environment/Assets/ML-Agents/Scripts/Agent.cs

     }
 
     /// <summary>
-    /// Adds a vector observation. 
-    /// Note that the number of vector observation to add
+    /// Appends float values to the vector observation.
+    /// Note that the total number of vector observation added
-    /// <param name="observation">The float value to add to 
+    /// <param name="observation">The value to add to 
+    internal void AddVectorObs(int observation)
+    {
+        _info.vectorObservation.Add((float)observation);
+    }
+    internal void AddVectorObs(Vector3 observation)
+    {
+        _info.vectorObservation.Add(observation.x);
+        _info.vectorObservation.Add(observation.y);
+        _info.vectorObservation.Add(observation.z);
+    }
+    internal void AddVectorObs(Vector2 observation)
+    {
+        _info.vectorObservation.Add(observation.x);
+        _info.vectorObservation.Add(observation.y);
+    }
+    internal void AddVectorObs(float[] observation)
+    {
+            _info.vectorObservation.AddRange(observation);
+    }
+    internal void AddVectorObs(List<float> observation)
+    {
+            _info.vectorObservation.AddRange(observation);
+    }
+
+
+    /// <summary>
+    /// Sets the text observation.
+    /// </summary>
+    /// <param name="s">The string the text observation must be set to.</param>
     internal void SetTextObs(object s)
     {
         _info.textObservation = s.ToString();