Chage NewRequest methods, add multi description kind to thing

Since Reddit's API accepts form data as the body for most of its
endpoints, it made sense to me to make the default NewRequest method
set the request body as form data (if provided of course). The
NewJSONRequest method can accept a JSON body.

Signed-off-by: Vartan Benohanian <vartanbeno@gmail.com>

reddit/reddit.go

@@ -217,10 +217,36 @@ func (c *Client) UserAgent() string {
 	return c.userAgent
 }
 
-// NewRequest creates an API request with a JSON body.
+// NewRequest creates an API request with form data as the body.
+// The path is the relative URL which will be resolves to the BaseURL of the Client.
+// It should always be specified without a preceding slash.
+func (c *Client) NewRequest(method string, path string, form url.Values) (*http.Request, error) {
+	u, err := c.BaseURL.Parse(path)
+	if err != nil {
+		return nil, err
+	}
+
+	var body io.Reader
+	if form != nil {
+		body = strings.NewReader(form.Encode())
+	}
+
+	req, err := http.NewRequest(method, u.String(), body)
+	if err != nil {
+		return nil, err
+	}
+
+	c.appendJSONExtensionToRequestURLPath(req)
+	req.Header.Add(headerContentType, mediaTypeForm)
+	req.Header.Add(headerAccept, mediaTypeJSON)
+
+	return req, nil
+}
+
+// NewJSONRequest creates an API request with a JSON body.
 // The path is the relative URL which will be resolved to the BaseURL of the Client.
 // It should always be specified without a preceding slash.
-func (c *Client) NewRequest(method string, path string, body interface{}) (*http.Request, error) {
+func (c *Client) NewJSONRequest(method string, path string, body interface{}) (*http.Request, error) {
 	u, err := c.BaseURL.Parse(path)
 	if err != nil {
 		return nil, err
@@ -247,27 +273,6 @@ func (c *Client) NewRequest(method string, path string, body interface{}) (*http
 	return req, nil
 }
 
-// NewRequestWithForm creates an API request with form data.
-// The path is the relative URL which will be resolves to the BaseURL of the Client.
-// It should always be specified without a preceding slash.
-func (c *Client) NewRequestWithForm(method string, path string, form url.Values) (*http.Request, error) {
-	u, err := c.BaseURL.Parse(path)
-	if err != nil {
-		return nil, err
-	}
-
-	req, err := http.NewRequest(method, u.String(), strings.NewReader(form.Encode()))
-	if err != nil {
-		return nil, err
-	}
-
-	c.appendJSONExtensionToRequestURLPath(req)
-	req.Header.Add(headerContentType, mediaTypeForm)
-	req.Header.Add(headerAccept, mediaTypeJSON)
-
-	return req, nil
-}
-
 // Response is a Reddit response. This wraps the standard http.Response returned from Reddit.
 type Response struct {
 	*http.Response