Bug 1061134 - Use DeleteFilesRecursive from edify generator. r=gsvelto

Should this patch break your build, make sure your platform/build repo
is up to date. See bug 1058511.
Make .gitignore a bit more useful.
Merge pull request #396 from khuey/gitignore-updates

Make .gitignore a bit more useful.
Bug 1084625 - Don't give misformatted negative numbers to profile symbolication tools.

Bonus fix: comment typo.
Merge pull request #397 from jld/symbolicate-minus-one

Bug 1084625 - Don't give misformatted negative numbers to profile symbolication tools. r=BenWa
Bug 1085525 - |profile-symbolicate.py| expects proper python to be in |/usr/bin|. r=dhylands
Merge pull request #399 from EricRahm/bug_1085525

Bug 1085525 - |profile-symbolicate.py| expects proper python to be in |/...
Merge pull request #386 from comoyo/bug1061134

Bug 1061134 - Use DeleteFilesRecursive from edify generator. r=gsvelto
Bug 1084226 - Add TaskTracer feature to profile.sh. r=BenWa