Emailaggregation

Hmm, this seems to be a discrepancy between the backend and frontend.

Backend
```javascript
$ node
> var Sanitization = require('oae-util/lib/sanitization');
undefined
> Sanitization.encodeForURL('/foo/bar')
'/foo/bar'
```

Frontend:
```
encodeForURL('/foo/bar#bleh')
"%2Ffoo%2Fbar%23bleh"
```

It's probably fine to not encode these URLs at all as they're generated on the backend. wdyt?