Extend place title with submenu options

I've added new options for the component "place_title", so it can have submenus. 
Also, I've added new options for the submenu for images and buttons.

This is how it looks:
![place_title](https://cloud.githubusercontent.com/assets/1152640/5279782/a6cf023e-7ae8-11e4-826c-c5a6a6517926.gif)

And you could cut out one line and a var: 

```
this.navItemTemplate = $("#tmpl-nav-item").text()

this.$el.length && this.navItemTemplate && this.init();