By RICHARD GINTOWT
Look out Robert Pollard - Justin Ripley is hot on your tail.
The moppy-haired Lawrence expatriate is releasing a 28-song solo album called Vowels, and it's got at least as many keepers as Standard Gargoyle Decisions (or any other substandard Pollard opus of late). Recorded mostly at his pad in Seattle (where Ripley's been hanging out since jettisoning Lawrence a year ago), Vowels is a mixed bag of singer-songwritery folk, lo-fi indie pop and quirky instrumentals. It's a b