Added support for conditionals inside iterators

```html
@If.HasUsers
Yay Users! 
@EndIf
@Each.Users
    @Current.Name says: 
    @If.IsFromGreece
        <b>Yay Greece!</b>
    @EndIf
    @IfNot.IsFromGreece
        <b>Boo Greece!</b>
    @EndIf
@EndEach
```

Result:
```html
Yay Users!
Bob says:<b>Yay Greece!</b>
Malin says:<b>Boo Greece!</b>
```