chore(vscode): add jsconfig.json and remove .settings dir

VSCode recognizes jsconfig.json for es6 code in the same way as it recognizes tsconfig.json for ts code.

Closes #4955

.gitignore

@@ -29,6 +29,7 @@ tmp
 pubspec.lock
 .c9
 .idea/
+.settings/
 *.swo
 modules/.settings
 .vscode

.settings/settings.json

@@ -1,12 +0,0 @@
-{
-	"search.exclude": {
-		".git" : true,
-		".idea": true,
-		"node_modules" : true,
-		"bower_components" : true,
-		"packages" : true,
-		"build" : true,
-		"dist" : true,
-		"tmp" : true
-	}
-}

tools/jsconfig.json

@@ -0,0 +1,7 @@
+{
+  "compilerOptions": {
+    "target": "es6",
+    "module": "commonjs"
+  }
+}
+