张磊 / FileStorageBeego

Makes RenderForm use textarea-element when form type is `textarea`

When RenderForm encounters a field with the structTag `form` value
type `textarea` it renders an actual <textarea> html tag.

Extracted a func `parseFormTag` that takes a reflect.StructField
and returns the different positional parts of the `form` structTag
with default values as documented in
http://beego.me/docs/mvc/view/view.md#renderform

This makes RenderForm shorter and makes it possible to test the
parsing separately.

* not match the empty route

ignore nil time

update chat example

config: fix error when json config starts with an array

runmode = dev
appname = doraemon
[dev]
httpport = 8880
sessionon = true

[prod]
httpport = 8888
sessionon = true

[test]
httpport = 8080
sessionon = false