Ducky docs generation

Now, if you run `jake docs` in the root of the player, JSDuck will scan `./src/` directory for javascript files with documentation and put the generated result into `./doc/api/` directory.
Ok, I'll mark them as `@private` for now, while I'll be writing new docs, with removing underscores in parallel, and at some point we'll try to move all methods marked as such in some private space. Deal.