Add New Transports

[abmusse]

I propose we add additional transports to the toolkit.

Currently the toolkit supports 2 transports REST and DB2 (calling idb-connector stored proceduce)

We can enhance the itoolkit by incorporating

• ODBC transport
• SSH transport
• idb-pconnector (Explore ways of making use of connection pooling)

ODBC and SSH transports would allow users from non IBM i machines to use the itoolkit.

To do so we would need to update iConn constructor see #25

The current signature of iConn constructo (database, user, password [,restOptions]) will use rest transport when the fourth positional argument is an object.

Otherwise will use idb-connector as the transport.

Also we should move all transports under a single directory lib/transports

[abmusse]

ODBC and SSH transports added.

With the current design of itoolkit where transports open and close connections after each call to Connection.run() using Connection pooling from idb-pconnector opening and closing the pool would be very useful.

In the future, if we change our design to keep connections alive it would be very benefital to use idb-pconnector as a transport over idb-connector.