Expose Alert's 'id' field.
Expose Alert's 'id' field.

It's unique, but please don't use it to construct
URLs from it, the url field than is still
authoritative.
johanneswilm/eha-nutsurv-django,johanneswilm/eha-nutsurv-django,eHealthAfrica/nutsurv,eHealthAfrica/nutsurv,eHealthAfrica/nutsurv,johanneswilm/eha-nutsurv-django