Revisions & Add Entity Translation support to Meta Tags

Hi there,

If I have Entity Translation enabled and I create a node with 2 variations (EN and FR) for example. There is an issue with Meta-tags and entity translation where if I 'create a new revision' when updating my node - the associated translations are stored under the old 'revision_id' in the metatag table while the node is using the new revision ID. This means that only the most recently updated language's metatag data shows up.

Steps to recreate

1) Create Node in English with Entity Translation enabled
2) Translate Node
3) Update Meta Tags for each language
---
you should have a node, in 2 languages, with appropriate meta tags for each
---
4) Now edit one of the languages for the node and click 'create new revision'
5) The language that you have just updated - the metatags work, the metatags on the other language do not.

This is using latest dev code (7.x-1.x-dev - 2013-Sep-06)