conn > con in tutorial app
conn > con in tutorial app

Every sql connection is abbreviated to `conn` except for the very first `con`. Changed everything to `conn` for consistency.
oz123/bottle,bottlepy/bottle,bottlepy/bottle,ifduyue/bottle,defnull/bottle,ifduyue/bottle,fkazimierczak/bottle,fkazimierczak/bottle,oz123/bottle,defnull/bottle