Change HTTP methods for OpenStack Compute
diff --git a/openstack/compute/v2/extensions/floatingip/requests.go b/openstack/compute/v2/extensions/floatingip/requests.go
index 1fad93a..8abb72d 100644
--- a/openstack/compute/v2/extensions/floatingip/requests.go
+++ b/openstack/compute/v2/extensions/floatingip/requests.go
@@ -45,10 +45,8 @@
 		return res
 	}
 
-	_, res.Err = client.Request("POST", createURL(client), gophercloud.RequestOpts{
-		JSONBody:     reqBody,
-		JSONResponse: &res.Body,
-		OkCodes:      []int{200},
+	_, res.Err = client.Post(createURL(client), reqBody, &res.Body, &gophercloud.RequestOpts{
+		OkCodes: []int{200},
 	})
 	return res
 }
@@ -56,16 +54,14 @@
 // Get returns data about a previously created FloatingIP.
 func Get(client *gophercloud.ServiceClient, id string) GetResult {
 	var res GetResult
-	_, res.Err = client.Request("GET", getURL(client, id), gophercloud.RequestOpts{
-		JSONResponse: &res.Body,
-	})
+	_, res.Err = client.Get(getURL(client, id), &res.Body, nil)
 	return res
 }
 
 // Delete requests the deletion of a previous allocated FloatingIP.
 func Delete(client *gophercloud.ServiceClient, id string) DeleteResult {
 	var res DeleteResult
-	_, res.Err = client.Request("DELETE", deleteURL(client, id), gophercloud.RequestOpts{})
+	_, res.Err = client.Delete(deleteURL(client, id), nil)
 	return res
 }
 
@@ -79,9 +75,7 @@
 	addFloatingIp["address"] = fip
 	reqBody := map[string]interface{}{"addFloatingIp": addFloatingIp}
 
-	_, res.Err = client.Request("POST", associateURL(client, serverId), gophercloud.RequestOpts{
-		JSONBody: reqBody,
-	})
+	_, res.Err = client.Post(associateURL(client, serverId), reqBody, nil, nil)
 	return res
 }
 
@@ -93,8 +87,6 @@
 	removeFloatingIp["address"] = fip
 	reqBody := map[string]interface{}{"removeFloatingIp": removeFloatingIp}
 
-	_, res.Err = client.Request("POST", disassociateURL(client, serverId), gophercloud.RequestOpts{
-		JSONBody: reqBody,
-	})
+	_, res.Err = client.Post(disassociateURL(client, serverId), reqBody, nil, nil)
 	return res
 }