support commtrack in cloudcare

three big changes:

- include the footprint by default in cloudcare (enables delegation workflows including the user/supply point link) https://github.com/dimagi/commcare-hq/commit/d62a935efd56edc972ea788beffe2d12fc64459c
- add ledger cloudcare API https://github.com/dimagi/commcare-hq/commit/d124e5dcd6053035eecb9dd13a6e62c809ae0967
- touchforms support for ledgers: https://github.com/dimagi/touchforms/pull/64

![image](https://cloud.githubusercontent.com/assets/66555/4599303/850a81ee-50c4-11e4-9d4c-8a4fa3beb1d3.png)