Added native auto-fill support for URL input in Chrome.

res/app/components/stf/common-ui/enable-autofill/README.md

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+# enable-autofill
+
+This directive enables autofill (HTML5 autocomplete) on the selected form.
+
+Currently this is only needed in `Chrome` because `autofill` only works on form `POST` method.
+
+Based on [this](http://stackoverflow.com/questions/16445463/how-to-get-chrome-to-autofill-with-asynchronous-post/22191041#22191041).
+
+## Usage
+
+```html
+<form enable-autofill action="about:blank">
+	<input type="text" autocomplete="on">
+</form>  
+```
+
+This will create the following DOM:
+
+```html
+<iframe src="about:blank" name="_autofill" style="display:none">
+<form method="post" action="about:blank" target="_autofill">
+	<input type="text" autocomplete="on">
+</form>  
+```
+
+Yes, it is a bit ugly but it is currently the only way. 
+
+It will create only one `iframe` which will be reused.