Added check to prevent user from executing a use statement from an active session.
Updated README.md with examples of defining the default keyspace correctly for a session.
Cleaned up code to streamline the connection being added to the pool and removed code related to old keyspace behaviour.
Merge pull request #144 from phillipCouto/prevent_use_keyspace

Prevent use keyspace
Add a test to check creating a session with an invalid keyspace
Dont hide the error from UseKeyspace during createSession connects
Setup the keyspace before creating a session
close the session after use