zed: upgrade to 1.0 version

Has not got a github release of version 1.0 yet, but there is a blog post about it already[1] and I am using it for a week now - works great. There is also only one more ticket to the 1.0 milestone[2] which I think it has not got anything with the code therefore this pull request is valid.

[1] http://zedapp.org/2014/09/the-changelog-1-0/
[2] https://github.com/zedapp/zed/milestones/1.0