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

Former-commit-id: ed635ee95de7160cde11eaabc0c1dcb0e460a620

_examples/view/herotemplate/README.md

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+# Hero Template Example
+
+This folder contains the iris version of the original hero's example: https://github.com/shiyanhui/hero/tree/master/examples/app.
+
+Iris is 100% compatible with `net/http` so you don't have to change anything else
+except the handler input from the original example.
+
+The only inline handler's changes were:
+
+From:
+
+```go
+if _, err := w.Write(buffer.Bytes()); err != nil {
+// and
+template.UserListToWriter(userList, w)
+```
+To: 
+```go
+if _, err := ctx.Write(buffer.Bytes()); err != nil {
+// and
+template.UserListToWriter(userList, ctx)
+```
+
+So easy.
+
+Read more at: https://github.com/shiyanhui/hero