185

Hello again! Found another simple bug to squash. This should address #185.

I've removed the devise helper for errorrs, and placed them into an alert box. 

This bit of code may make more sense in a helper so all forms will have the same UI. 

I also removed the devise shared links, as they seemed out of place. 
I'm also not sure whether we want to start center-aligning headers (not made explicit in the styles, maybe I should).

If you decide that you want to anyway, it should be a with a style `text-transform: center` rather than using the `<center>` tags. It's [been deprecated in HTML4](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/center).