refs #7488
- to be able to refactor the url configuration in ghost, we need to go step by step making this possible
- reduce the usage of forceAdminSSL
- add a urlFor('admin') helper, which returns the admin url + path e.g. http://my-blog.com/blog/ghost
- increase usage of urlFor helper
- do not expose getBaseUrl, use urlFor('home') (home === blog)
refs #7666
Using `urlFor('home')` instead `config.get('url')` in Ghost.
When `urlFor('home', true)` returns the absolute adress of the blog as defined in the config.
Will always return a trailing `/`.
