Updated AuditTrail, DataAccess.Core and Sitefinity.Core to Sitefinity 7.1. Beta2

Updated AuditTrail, DataAccess.Core and Sitefinity.Core to Sitefinity
7.1. Beta2
Merge pull request #3 from Sitefinity/review

Updated AuditTrail, DataAccess.Core and Sitefinity.Core to Sitefinity 7....