fix load() causing 'exit 1' on missing optional file $PROFILES/postswitch

    load() should return 1 and hence cause 'exit 1' on a missing
    config file but it should not implicitly return 1 on a missing
    optional file $PROFILES/postswitch
Merge pull request #4 from stormc/master

fix load() causing 'exit 1' on missing optional file $PROFILES/postswitch