Fix problems with inlined simple type element

```
	assert.go:24: got type GetInfo struct {
	XMLName	xml.Name	`xml:"http://www.mnb.hu/webservices/ GetInfo"`

	Id	struct {
	}	`xml:"Id,omitempty"`
} want type GetInfo struct {
	XMLName	xml.Name	`xml:"http://www.mnb.hu/webservices/ GetInfo"`

	Id	string	`xml:"Id,omitempty"`
}
```

types_tmpl.go

@@ -7,14 +7,17 @@ package gowsdl
 var typesTmpl = `
 {{define "SimpleType"}}
  {{$type := replaceReservedWords .Name | makePublic}}
+ {{if .Doc}} {{.Doc | comment}} {{end}}
  type {{$type}} {{toGoType .Restriction.Base}}
+ {{if .Restriction.Enumeration}}
  const (
  {{with .Restriction}}
  {{range .Enumeration}}
  {{if .Doc}} {{.Doc | comment}} {{end}}
  {{$type}}{{$value := replaceReservedWords .Value}}{{$value | makePublic}} {{$type}} = "{{goString .Value}}" {{end}}
  {{end}}
  )
+ {{end}}
 {{end}}
 
 {{define "ComplexContent"}}
@@ -65,11 +68,14 @@ var typesTmpl = `
  {{removeNS .Ref | replaceReservedWords | makePublic}} {{if eq .MaxOccurs "unbounded"}}[]{{end}}{{.Ref | toGoType}} ` + "`" + `xml:"{{.Ref | removeNS}},omitempty"` + "`" + `
  {{else}}
  {{if not .Type}}
- {{template "ComplexTypeInline" .}}
- {{else}}
- {{if .Doc}}
- {{.Doc | comment}} {{"\n"}}
+ {{if .SimpleType}}
+ {{if .Doc}} {{.Doc | comment}} {{end}}
+ {{ .Name | makeFieldPublic}} {{toGoType .SimpleType.Restriction.Base}} ` + "`" + `xml:"{{.Name}},omitempty"` + "`" + `
+ {{else}}
+ {{template "ComplexTypeInline" .}}
  {{end}}
+ {{else}}
+ {{if .Doc}}{{.Doc | comment}} {{end}}
  {{replaceReservedWords .Name | makeFieldPublic}} {{if eq .MaxOccurs "unbounded"}}[]{{end}}{{.Type | toGoType}} ` + "`" + `xml:"{{.Name}},omitempty"` + "`" + ` {{end}}
  {{end}}
  {{end}}

xsd.go

@@ -110,6 +110,7 @@ type XSDAttribute struct {
 // and information about the values of attributes or text-only elements.
 type XSDSimpleType struct {
  Name string `xml:"name,attr"`
+ Doc string `xml:"annotation>documentation"`
  Restriction XSDRestriction `xml:"restriction"`
 }