Second sprint

We have closed the second sprint.

Wow! Things are more complex than we expected. This sprint we have focused on upgrading what is already there:
 - Change how rates are defined. Now we can define a tariff in different units (i.e. 1€/KHz/month or 10€/MHz/month, etc)
- Tiered rates. Now we can define tiers for rating (1-2 CPU 5€/mont, 3-4 CPU 9€/mont, etc)
- Currency management, we have starting adding definition for currencies.

And then we came to Rails... Coding an enterprise grade application is complex, and there is a bunch of controllers that we need to understand... and we couldn't.

So we have closed the sprint a little too soon and we will need to continue working on this. We needed to take the decission of whether to delay the sprint for a week or close it as it is... and we decided to close it. No demo to be shown, a lot of things learned.

Now we need to define the next sprint.