add the dev branch

Also note that you are committing to the master branch, which is currently presented as a Drupal 5 branch.

#1 is important because even if you don't publish the dev branch on the project page, people expect 'drush dl filecache-7.x-1.x-dev' to pull the latest dev release. Currently that pulls an old version, because your '7.x-1.x' head is way behind.

Please consider doing

git checkout 7.x-1.x
git pull master # is fast-forward only
git branch -d master

and syncing that with the drupal.org repo.

We should have -dev releases now.