Change Block Storage v1 Snapshots.CreatedAt Type (#31)

* Change Block Storage v1 Snapshots.CreatedAt Type

This commit changes the Snapshots.CreatedAt type from
gophercloud.JSONRFC3339Milli to gophercloud.JSONRFC3339MilliNoZ.

* Adding Description to expected results
diff --git a/openstack/blockstorage/v1/snapshots/results.go b/openstack/blockstorage/v1/snapshots/results.go
index 195200d..2bcb74f 100644
--- a/openstack/blockstorage/v1/snapshots/results.go
+++ b/openstack/blockstorage/v1/snapshots/results.go
@@ -23,10 +23,10 @@
 	Bootable string `json:"bootable"`
 
 	// Date created.
-	CreatedAt gophercloud.JSONRFC3339Milli `json:"created_at"`
+	CreatedAt gophercloud.JSONRFC3339MilliNoZ `json:"created_at"`
 
 	// Display description.
-	Description string `json:"display_discription"`
+	Description string `json:"display_description"`
 
 	// See VolumeType object for more information.
 	VolumeType string `json:"volume_type"`