update *Sublime Text* project file
`scripts` -> `plugins` and `adaptor` -> `adapter`
update `license` to MIT in `package.json`
fixed incorrect `main` in `package.json`
major rewrite: adapters, core split into parts

Introducing adapters (which are just like adapters for *hubot*): Use
*geoffrey* with different communication channels! Built in: HTTP and
shell adapters.

The core code is now split into classes `Bot`, `Adapter` and `Plugin`.
Adapters and plugins extend these base classes.