Add isInitialized()

[adria0]

It's not usual to use an external property with different semantics (address(childVault) == 0) that the propery name says. Maybe is usefull to add a function like isInitialized() for this:

Instead:

function topUpVault() initialized notCanceled {
        ...
        Vault childVault = Vault(vc.primaryVault());
        if (address(childVault) == 0) throw; // Child project is not initialized
        ...
}

use

function topUpVault() initialized notCanceled {
        ...
        if (!vc.isInitialized())  throw;
        Vault childVault = Vault(vc.primaryVault());
        ...
}

[jbaylina]

Your optios takes two calls instead of one and needs an extra method. (We need to safe gas in the deployment).