Use scp instead of lftp and set LOCALES_FILE by default.
Compute addon version out of package.json. Update lastest symbolic links on ftp.
Update gaia+gecko and bump to 6.0pre5dev.
Ensure building apps being used in production (allows marketplace to be installed)
Fix file permissions on ftp and fix production target on windows.
Merge pull request #842 from ochameau/ftp-tweaks

Ftp releasing tweaks
Merge pull request #851 from ochameau/fix-marketplace

Ensure building apps being used in production (allows marketplace to be installed)