tree c4e95f0a3657f05176b0898b38984c5ccf3370aa
parent 0256f6963b36d5f6ab13b53787b0bff2b4bee0ce
author Roy Williams <royw@fb.com> 1380835181 -0700
committer Michael Bolin <mbolin@fb.com> 1381265657 -0700

Output traces to a buck-logs directory and save the last 25 of them by default.

Summary:
A lot of users complain about a problem,
but then run `buck clean` and the log is gone.
Let's use that disk space!

Test Plan: Unit tests, tested locally.