Upgrading to support 0.4 features

[ErisDS]

Just thought I'd drop in and post a link to theme developer guide to what changed in Ghost 0.4.

I'm trying to encourage as many theme devs as possible to upgrade to use the {{asset}} helper in particular. Without this change, your theme won't work when Ghost is installed in a subdirectory, and users may encounter caching problems.

Thanks 👍