Include $(TARGET_DEVICE) in mar filenames to avoid mars stomping on each other.
Bug 1008094 - Call FOTA production with device and gonk checking r=gsvelto
Merge pull request #165 from lissyx/bug1008094

Bug 1008094 - Call FOTA production with device and gonk checking r=gsvelto
Merge pull request #158 from bhearsum/better-mar-name

Bug 1000207 - Include in mar names, because they're uploaded to common directories. r=dhylands