Added configurable schema

schema.go

@@ -29,7 +29,8 @@ import (
 
 // An upgrader verifies the schema for one or more databases and upgrades them if possible.
 type Upgrader struct {
-	databases map[string]Database
+	schema      string
+	databases   map[string]Database
 	logCallback func(string, string)
 	sqlCallback func(string, int) ([]byte, bool)
 }
@@ -41,7 +42,7 @@ type Database struct {
 	Username string
 	Password string
 
-	db *sql.DB
+	db       *sql.DB
 	upgrader *Upgrader
 }