Filing all the TODOs as issues

Fixes #555

Now running `$grunt todo` will give you a list of all the "TODO" comments in the repo (along with their corresponding bug numbers).

```
$ grunt todo
Running "todo:app" (todo) task

app/index.html

	line 28  TODO  - (Issue #556) this needs to be translated on the server -->

app/scripts/views/complete_sign_up.js

	line 54  TODO  - (Issue #557) we could go to a "sign_up_complete" screen here.

app/styles/main.css

	line 685  TODO  : (Issue #558) These need further consideration */
	line 693  TODO  : (Issue #559) Confirm breakpoint sizes */

grunttasks/requirejs.js

	line 15  TODO  : (Issue #560) Figure out how to make sourcemaps work with grunt-usemin

tests/functional/complete_sign_up.js

	line 32  TODO  - (Issue #561) get the REAL token and UID, either programmatically

tests/intern_sauce.js

	line 19  TODO  (Issue #562) No IE support yet

Done, without errors.
```