Fix UXML paths

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Blackboard/Blackboard.cs

 using System;
-using System.Collections.Generic;
 using UnityEditor.Experimental.UIElements.GraphView;
 using UnityEngine;
 using UnityEngine.Experimental.UIElements;
         public Blackboard()
         {
             AddStyleSheetPath("Styles/Blackboard");
-            var tpl = AssetDatabase.LoadAssetAtPath<VisualTreeAsset>("Assets/UnityShaderEditor/Editor/Resources/UXML/GraphView/Blackboard.uxml");
+            var tpl = Resources.Load<VisualTreeAsset>("UXML/GraphView/Blackboard");
 
             m_MainContainer = tpl.CloneTree(null);
             m_MainContainer.AddToClassList("mainContainer");

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Blackboard/BlackboardField.cs

 
         public BlackboardField(Texture icon, string text, string typeText)
         {
-            var tpl = AssetDatabase.LoadAssetAtPath<VisualTreeAsset>("Assets/UnityShaderEditor/Editor/Resources/UXML/GraphView/BlackboardField.uxml");
+            var tpl = Resources.Load<VisualTreeAsset>("UXML/GraphView/BlackboardField");
             VisualElement mainContainer = tpl.CloneTree(null);
 
             mainContainer.AddToClassList("mainContainer");

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Blackboard/BlackboardRow.cs

 
         public BlackboardRow(VisualElement item, VisualElement propertyView)
         {
-            var tpl = AssetDatabase.LoadAssetAtPath<VisualTreeAsset>("Assets/UnityShaderEditor/Editor/Resources/UXML/GraphView/BlackboardRow.uxml") as VisualTreeAsset;
+            var tpl = Resources.Load<VisualTreeAsset>("UXML/GraphView/BlackboardRow");
             VisualElement mainContainer = tpl.CloneTree(null);
             mainContainer.AddToClassList("mainContainer");
 

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Blackboard/BlackboardSection.cs

 
         public BlackboardSection()
         {
-            var tpl = AssetDatabase.LoadAssetAtPath<VisualTreeAsset>("Assets/UnityShaderEditor/Editor/Resources/UXML/GraphView/BlackboardSection.uxml") as VisualTreeAsset;
+            var tpl = Resources.Load<VisualTreeAsset>("UXML/GraphView/BlackboardSection");
             m_MainContainer = tpl.CloneTree(null);
             m_MainContainer.AddToClassList("mainContainer");
 

MaterialGraphProject/Assets/UnityShaderEditor/package.json

 {
     "name": "com.unity.shadergraph",
     "description": "Shader Graph",
-    "version": "0.1.15",
+    "version": "0.1.16",
     "unity": "2018.1",
     "dependencies": {
     }