MVC example - Improve way CampaignName and FundraiserName are set for DonationViewModel

[alindgren]

Currently iterating through each donation to set the FundraiserName and loading the Fundraiser entity for each donation. See https://github.com/alindgren/Fundraise/blob/master/Fundraise.MvcExample/Controllers/ProfileController.cs#L40-L48

[alindgren]

With #10, this might be necessary.