v1.4.0 + #1631 (remove go1.6/go1,7 support) (#1851)

* remove go1.6 support

* remove build tag

* remove todo

* remove go1.6 support: https://github.com/gin-gonic/gin/pull/1383/commits

* update readme

* remove go1.7 support

* fix embedmd error

* test

* revert it

* revert it

* remove context_17

* add pusher test

* v1.4.0 rc1

render/json.go

@@ -43,6 +43,11 @@ type AsciiJSON struct {
 // SecureJSONPrefix is a string which represents SecureJSON prefix.
 type SecureJSONPrefix string
 
+// PureJSON contains the given interface object.
+type PureJSON struct {
+	Data interface{}
+}
+
 var jsonContentType = []string{"application/json; charset=utf-8"}
 var jsonpContentType = []string{"application/javascript; charset=utf-8"}
 var jsonAsciiContentType = []string{"application/json"}
@@ -174,3 +179,16 @@ func (r AsciiJSON) Render(w http.ResponseWriter) (err error) {
 func (r AsciiJSON) WriteContentType(w http.ResponseWriter) {
 	writeContentType(w, jsonAsciiContentType)
 }
+
+// Render (PureJSON) writes custom ContentType and encodes the given interface object.
+func (r PureJSON) Render(w http.ResponseWriter) error {
+	r.WriteContentType(w)
+	encoder := json.NewEncoder(w)
+	encoder.SetEscapeHTML(false)
+	return encoder.Encode(r.Data)
+}
+
+// WriteContentType (PureJSON) writes custom ContentType.
+func (r PureJSON) WriteContentType(w http.ResponseWriter) {
+	writeContentType(w, jsonContentType)
+}