Touching on a link loads a web view with the link content

To do so we:

1. Created a view controller that loads a web view
2. Made the posts view controller the delegate for the touch on links

Unlike before with the scrollview here we're passing a delegate reference around. This is a bit inconsistent to be fair, but it's simpler that implementing the block. At the same time though this seemed to me like a more "natural" solution for a data source.
Back button is now white :wink:
UX touch: web view shows spinner while loading
Moved post loading into viewDidLoad

Otherwise the posts would be reloaded everytime we come back from the web view screen