BY ALISON GREEN, INC.COM COLUMNIST Here's a roundup of answers to four questions from readers. 1. How can I avoid talking shop outside of work? I have a colleague who I am sharing a few really challenging, long-term projects with. They're great to work with and we're getting a lot done. The only problem is that we live in the same part of town and frequently bump into each other on the way in -- which in itself is fine but they often immediately start talking about work, including ideas they've just had and are expecting my opinion on. I care about my work…