Create pg_settings-9.3-64

Added a pg_settings file for 9.3 according to instructions in the pgtune script:
psql postgres -c "COPY (SELECT name,setting,unit,category,short_desc,
    extra_desc,context,vartype,min_val,max_val,enumvals,boot_val
    FROM pg_settings WHERE NOT source='override')
    TO '/<path>/pg_settings-9.3-64'"