Pasta Salad with Shrimp, Goat Feta, and Basil

We've been pining for summer weather here in Boston. It's been cold, dreary, and drizzly for days. This pasta salad is like a little dose of summer—it's cool, creamy, and an absolutely fabulous thing to bring to a picnic or barbecue. Assuming, that is, that the sun ever comes out.