chore(.gitignore): ignore Dropbox folder (where signatures will be stored)
test(test/index.html): dead simply index page for running the library during development

TODO Automated unit tests
feat(src/determinater.coffee): signatures & comments

- determinater will now load and parse JSON signatures
from a CDN on startup (if the list has not yet already
been loaded in this browsing context).
- added a bunch of initial comments