Fixed broken build and added a getter for ValidatorFactory in
ValidationExtension

Commit dc4f82575434467756b01ec9f2c2804008ac750a changed
morphia-parent to 0.107 while left children at 0.106. This change
fixes it.

Also added a getValidation method in ValidationExtension see
https://github.com/mongodb/morphia/issues/573
Merge pull request #574 from jhooda/master

Fixed broken build and added a getter for ValidatorFactory in