bug 814759: don't clobber tb-rel-* directories. r=rail
bug 749071 - fix log rotation. r=rail
bug 841935 - add B2G_SYSTEM_APPS to releng-eng env. r=catlee
Bug: 843561 - WARNING - Failed to remove C:\slave\test\build on try 1. r+=aki
Bug 844982 - Address win8 required mozharness changes. r=aki
bug 779294 -  BaseConfig.py should allow for multiple config files. r=rail