Planemo shed_lint does not raise error if YAML owner does not match ToolShed owner

Hi :),

I was trying to create my repository following [this tutorial](https://planemo.readthedocs.org/en/latest/publishing.html), and faced errors on the creation and the update of the repository (The first time I used `shed_create` it kind of worked):

I created a [Gist](https://gist.github.com/remimarenco/842193c5aa8be458819b) to log the issues I encountered.

I wrote in the shed.yml a wrong owner name / a different owner name than the one I use in my toolshed account.
It is maybe the cause of the errors, as when I changed it, the creation worked (and my repository was not anymore in a weird state)
- Operating system: Mac OSX 10.11.3 / Planemo version: 0.23.0
- Steps to reproduce the bug:
- Create a tool on your computer, and populate it with a `shed_init` containing a owner name different than the one in your toolshed account
- Use `shed_create` to create your repository. It should create it, but with weird informations (I had a versioning like: "-1:00000000000")
- Try to `shed_create`, it should raise an error saying the repo **already** exists
- Try to `shed_update`, it should raise an error saying the repo **does not** exist

So I guess a PR to resolve this would contain:
- [ ] The linting detecting a difference between the public name in the repo of the user, and the one into the .shed.yml
- [ ] `shed_create` checking the same than linting
- [ ] Others planemo command that change or create repo and use the owner should also check this

Hope this helps!