Template hooks

[justintadlock]

We need a solid system of action hooks within the template files. Other plugins and themes need to be able to execute their code.

For the naming convention, I'm thinking something along the lines of:

mb_{$location}_before // before an element
mb_{$location}_after // after an element
mb_{$location}_open // just after an element is opened
mb_{$location}_close // just before an element is closed

[samikeijonen]

That sounds like a plan.