drupal-demo - Download l10n tarballs instead of svn (#96).

The SVN data is out-of-date and creates an extra dependency.
cividist - Update "l10n" using tarball
app/config/dist - Init l10n using tarball. Cache tarball (ttl=24hr).
app/config/caches.sh - Don't initialize l10n cache by default
app/config/*/drush.make.tmpl - l10n - Change SVN example to tarball example
civi-download-tools - Remove svn as hard dependency. None of the built-types depend on it.
Merge pull request #100 from totten/master-l10n-dl

INFRA-115, #96 - Download l10n tarballs instead of using SVN