Added YAML parser node (#1034)

Thanks @natcl -
(sorry pressed closed by mistake !)
* Added YAML parser node

* Added YAML error strings in messages.json

* Change location of YAML library import

* Remove copyright

* Remove copyright

* Change order of yaml in Template node

* Add YAML test

* Add working test

nodes/core/parsers/70-YAML.html

@@ -0,0 +1,31 @@
+<script type="text/x-red" data-template-name="yaml">
+    <div class="form-row">
+        <label for="node-input-name"><i class="fa fa-tag"></i> <span data-i18n="common.label.name"></span></label>
+        <input type="text" id="node-input-name" data-i18n="[placeholder]common.label.name">
+    </div>
+</script>
+
+<script type="text/x-red" data-help-name="yaml">
+    <p>A function that parses the <code>msg.payload</code> to convert a YAML string to/from a javascript object. Places the result back into the payload.</p>
+    <p>If the input is a YAML string it tries to parse it to a javascript object.</p>
+    <p>If the input is a javascript object it creates a YAML string.</p>
+</script>
+
+<script type="text/javascript">
+    RED.nodes.registerType('yaml',{
+        category: 'function',
+        color:"#DEBD5C",
+        defaults: {
+            name: {value:""}
+        },
+        inputs:1,
+        outputs:1,
+        icon: "parser-yaml.png",
+        label: function() {
+            return this.name||"yaml";
+        },
+        labelStyle: function() {
+            return this.name?"node_label_italic":"";
+        }
+    });
+</script>