Exit earlier if the database doesn't exist.
Fixed syntax error: The "IF NOT EXISTS" statement of "CREATE DATABASE" needs to be before "db_name". This statement can probably be removed as README requires database to pre-exist, and script will fail earlier if it does not.
The "-I" option of mdb-export requires an argument in the version in Debian Wheezy (0.7-1).
To address performance issue (autocommit) when importing source database as seperate inserts, moved to importing using mysqlimport.
Merge pull request #1 from hankintosh/fixes

Small fixes.