metadata.json: remove "version" field
Created by: mwilck
Delete the "version" field from metadata.json
. This is the result of discussions on #321 (closed), #323, #324, and extensions-web #102, extensions-web #95.
In order to not have to do this on every branch later, we should merge this PR before merging any "GNOME 3.3x support" PRs (#299, #312, #316, #323), even if it means that I need to rebase my PRs again.
@matthijskooijman, again, I couldn't invite you for review.