resolves#2170
- creates a models.init() function that requires all other model files
and caches them. This is opposed to the previous functionality where
when you require('./models') it would immediately require all other models.
Now it's done when you want.
- Updates all tests to reflect the new structure of the model module
closes#2148
- Added core/server/xmlrpc.js
- Hook into post::saved to ping when a published post gets saved
- Added node package to hook into http requests
