Make this script work again
Keep parsed files for reuse
Add support for parsing placeables
Clean temporary files
Add command line parsing

Now accepts options to control what to benchmark, and can use existing
PO files as well.
Sort by total time
Exlde gstreamer when building XPIs
Allow overide on MOZ_APP_MAXVERSION

Adds option --soft-max-version.  This allows a 'soft' version number thus an
Aurora XPI of 24.0a2 will have an maximum compatible version of 24.0.* instead
of 24.0a2. This should allow someone to download an Aurora language pack and
use it in the final release.

Fix bug 3047