Allow multiple devs on same machine to use mogenerator

When more than one developer is building on the same
machine, an issue existed where the build would fail.
The mogenerator-Info.plist file would be owned by a
different user and could not be removed. This patch
makes sure that a per-user temp dir is being used.

Signed-off-by: Annard Brouwer <a.brouwer@qsrinternational.com>
Merge pull request #255 from annard/multiuser

[DEV] Built into $TMPDIR instead of hard-coding /tmp to allow concurrent building of mogenerator. (Annard Brouwer)