reorganization of _examples and add some new examples such as iris+groupcache+mysql+docker

Former-commit-id: ed635ee95de7160cde11eaabc0c1dcb0e460a620

_examples/view/quicktemplate/templates/index.qtpl

@@ -0,0 +1,12 @@
+Index template, implements the Partial's methods.
+
+{% code
+type Index struct {}
+%}
+
+{% func (i *Index) Body() %}
+	<h1>Index Page</h1>
+	<div>
+		This is our index page's body.
+	</div>
+{% endfunc %}