Autocommit=True for read-only queries.

TKP-web is a read-only app. Autocommit must be switched to on, otherwise
all queries will start in a transaction which is not committed by the code.
This caused the sql_logs files to continuously growing, since multiple
transactions were active.
Merge pull request #30 from bartscheers/autocommiton

Autocommit=True for read-only queries.