Ability to use Aggregate Projections on Projections

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This is a cummulative patch for issues NH1393 and NH1394

The patch is invalid. Please wait and I'll send one more

This introduces the forgetten Sum(IProjection) method.

This patch brings the ability to use aggregate projections on projections.
It also fixes the bug in calculating the average.
For example,
if we have data
1,2,3,4 and take the average the result will be 2 because they are integers, but I believe it should be 2.5.
In order to achieve this, I've changed the constructor of AvgProjection like this

public class AvgProjection : AggregateProjection
{
public AvgProjection(String propertyName)
- : base("avg", propertyName)
+ : this(Projections.Property(propertyName))
{
}
+ public AvgProjection(IProjection projection)
+ : base("avg",Projections.Cast(NHibernateUtil.Double,projection))
+ {
+ }

I am not sure if this brings problem though.