New file loading system.

[Aglezabad]

This is the current system:

• The plugin loads an array of file routes, all of them are set in docpad.coffee.
• All api entries are called from a unique base url.

Proposed new system:

• We will load multiple JSON files from docpad.coffee.
• The JSON file contains a list of file routes and a base url. So we can load different apis without mixing them.
• Also, each JSON file will set specific configuration for each api.

The benefits of the new system are:

• Loading different apis using different base urls.
• We can use two versions of the same api without refactoring old version.
• We can isolate each api, reducing debugging complexity.

[Aglezabad]

Code added and tested. Plugin version 2.2.1 tag beta.