Bug 914560 - Package XPI extensions during tools phase so that all required files are in place when running the packaging step, r=glandium
Backed out changeset 270d7ca88c31 (bug 906134)
Backed out changeset c6d7c7739056 (bug 906134) for too many intermittent failures
Backing out 2a19516ee700 (bug 912908) for causing bug 915536, rs=ttaubert over IRC
Merge m-c to fx-team.