Major improvements

[gaelazzo]

I've added:

• ability to open/close a connection
• execute non query commands
• management of multiple result set
• timeout param
• ability to connect to mySql database (with Linux and mono)
• null, datetime, smallint
• ability to get packets of data n-rows at a time (via a callback)

See jsSqlServerDriver or mySqlDriver for examples of using this library.

I hope someone will find it useful. Have fun.