Support for ODBC and SQL

Added support for ODBC and SQL database connections. The module assumes OLE DB by default however can be overridden in the initializer.

Here is an example:

const connectionString = 'Server=myServerAddress;Database=myDataBase;Trusted_Connection=True;';
const connectionType = 'sql';

const oledb = require('oledb');
const db = oledb(connectionString, connectionType);

...