Fix driver transaction behavior #84
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Context
Upon call to Conn.BeginTx(), Go driver continue to use underlying conn for QueryContext and ExecContext, expecting them to run in previously called transaction.
Fix
As sql.Conn is single threaded, Conn object keeps tracks of current open Tx. If no Tx is opened upon call to QueryContext or ExecContext, creates and autocommit transaction.
Tests
Closes #81