New manage currency dashboard copy

This is what the copy now looks like:

User has no trustlines and no balances
![screen shot 2014-09-10 at 11 27 09 am](https://cloud.githubusercontent.com/assets/5728307/4223019/4d0a7b78-3918-11e4-9494-68b6a58c57a3.png)

User has trustlines but not balances
![screen shot 2014-09-10 at 11 27 15 am](https://cloud.githubusercontent.com/assets/5728307/4223024/558f5958-3918-11e4-8a55-5d0227072885.png)

User has balances
![screen shot 2014-09-10 at 11 28 10 am](https://cloud.githubusercontent.com/assets/5728307/4223026/59b16936-3918-11e4-80eb-cf368321f845.png)

New add gateway messaging
![screen shot 2014-09-10 at 11 27 26 am](https://cloud.githubusercontent.com/assets/5728307/4223028/5b20db3a-3918-11e4-81fd-493cf07f52c0.png)

https://github.com/stellar/stellar-client/issues/791