Build automation

Add basic script for build automation needs for ShaderGraph

.gitignore

+artifacts/**
+build/**
 MaterialGraphProject/.vs
 MaterialGraphProject/.vscode
 MaterialGraphProject/Library

MaterialGraphProject/Assets/UnityShaderEditor/.npmignore

+artifacts/**
+build/**
+.npmignore

build.py

+#!/usr/bin/python -B
+import os
+import json
+import logging
+import shutil
+import textwrap
+
+sub_packages = {}
+sub_package_folders = {}
+publish_order = []
+
+def packages_list():
+    return [
+        ("com.unity.shadergraph", os.path.join("MaterialGraphProject", "Assets", "UnityShaderEditor"))
+    ]
+
+# helper function for preparations of tests
+def copy_path_to_project(path, repo_path, project_path, logger):
+    logger.info("Copying {}".format(path))
+    shutil.copytree(os.path.join(repo_path, path), os.path.join(project_path, "Assets", os.path.basename(path)))
+
+def copy_file_to_project(path, repo_path, project_path, logger):
+    logger.info("Copying {}".format(path))
+    shutil.copy(os.path.join(repo_path, path), os.path.join(project_path, "Assets", path))
+
+# Prepare an empty project for editor tests
+def prepare_editor_test_project(repo_path, project_path, logger):
+    copy_path_to_project(os.path.join("MaterialGraphProject", "Assets", "NewNodes"), repo_path, project_path, logger)
+    copy_path_to_project(os.path.join("MaterialGraphProject", "Assets", "TestAssets"), repo_path, project_path, logger)
+    copy_path_to_project(os.path.join("MaterialGraphProject", "Assets", "UnityShaderEditor", "Editor", "Testing"), repo_path, project_path, logger)
+
+if __name__ == "__main__":
+    import sys
+    sys.path.insert(0, os.path.abspath(os.path.join("..", "automation-tools")))
+    
+    try:
+        import unity_package_build
+        build_log = unity_package_build.setup()
+    except ImportError:
+        print "No Automation Tools found."