Bug 831147 - Integrate apitrace into build

Add apitrace repo to manifest files, so that it gets fetched
when the top-level ./config.sh script is run.
Merge pull request #77 from vasild/apitrace

Bug 831147 - Integrate apitrace into build
Bug 852583: switch emulator system/core and qemu-kernel to B2G github.

Change-Id: Ibc1989882c27f1fb790474e65ebb7333c93186ec
Merge pull request #66 from vicamo/bugzilla/852583/bluetooth-emulation

Bug 852583: switch emulator system/core and qemu-kernel to B2G github. r=mwu, f=jgriffin
backout bug 852583 because git.m.o syncing system does not handle new repositories
backout bug 831147 because git.m.o syncing system does not handle new repositories
bug 831147 - reland 91da030 now that repository is mirrored p=vd r=mwu
Merge pull request #66 from vicamo/bugzilla/852583/bluetooth-emulation

Bug 852583: switch emulator system/core and qemu-kernel to B2G github. r=mwu, f=jgriffin(cherry picked from commit abcffdac12c1c2c79e13f76405c47887308b3942)