Implements basic functionality described in #227 for loading plugins
from a specific directory and having a specific workflow with an init()
method and a disable() method.
- The fancyFirstChar plugin expected to always get an array of posts, and therefore broke on the single post pages
- Changed the plugin to cope with single objects as well as arrays
- Adding activePlugins array to config.js
- Adding a loadPlugins function to ghost.js
- Tweaking fancyFirstChar.js so that it works again, getting rid of the function wrapper and constructor