*: switch to github.com/ghodss/yaml for more consistent YAML parsing

ghodss/yaml converts from YAML to JSON before attempting to unmarshal.
This allows us to:

* Get the correct behavor when decoding base64'd []byte slices.
* Use *json.RawMessage.
* Not have to support extravagant YAML features.
* Let our structs use `json:` tags

storage/sql/config.go

@@ -12,7 +12,7 @@ import (
 // SQLite3 options for creating an SQL db.
 type SQLite3 struct {
 	// File to
-	File string `yaml:"file"`
+	File string `json:"file"`
 }
 
 // Open creates a new storage implementation backed by SQLite3