Added test for autocomplete info added to tag and attr

test/autotests/render/autocomplete/expected.html

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+Hello Frank!

test/autotests/render/autocomplete/marko.json

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+{
+    "tags-dir": "./tags"
+}

test/autotests/render/autocomplete/tags/test-hello/marko-tag.json

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+{
+    "renderer": "./renderer.js",
+    "@name": "string",
+    "@foo": {
+        "type": "number",
+        "autocomplete": [
+            {
+                "snippet": "foo=abc"
+            },
+            {
+                "snippet": "foo=def"
+            }
+        ]
+    },
+    "autocomplete": [
+        {
+            "displayText": "test-hello foo=${1:bar}",
+            "snippet": "test-hello foo=$1"
+        }
+    ]
+}

test/autotests/render/autocomplete/tags/test-hello/renderer.js

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+exports.render = function(input, out) {
+	out.write('Hello ' + input.name + '!');
+};

test/autotests/render/autocomplete/template.marko

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+<test-hello name="Frank"></test-hello>

test/autotests/render/autocomplete/test.js

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+exports.templateData = {};