Unit test: zero IPv4-UDP checksums.
Explicit address mapping.
This is the implementation of the draft http://tools.ietf.org/html/draft-anderson-v6ops-siit-eam-00, attending the issue #116.
The new files aren't incorporated to the jool application yet. We could say that this is an approach, we need to see how Jool will behave as a Stateles NAT64, and then connect this files.
I did a unit test to see if this new feature behave as expected.

TODO: I need to program how to delete an EAM entry from the database when requested. This will be ready when this feature are connected to Jool.
Merge branch 'unit_test_TODO' into ipv6_db
Merge branch 'EAM' into ipv6_db