fix nhibernate driver so that it starts (based on the appearance

changes it wouldn't come up).
include embedded dialect specific sql files for nhibernate migrations
figure out how to get the raw db connection so that migrations can
work with nhibernate.
create initial migration for NHibernate + SQLite + Assets.

OpenSim/Data/NHibernate/Resources/SQLiteDialect/001_AssetStore.sql

@@ -8,7 +8,7 @@ create table Assets(
        Description varchar(64),
        Local boolean,
        Temporary boolean,
-       Data blob,
+       Data blob
 );
 
 END;