Several corrections and improvements. See full description for more detail.

1. Corrected a bug in domain model. In countFact method there was a mistaken search, with the domain name.
2. Finished the domain test
3. Corrected a bug in host_mailer model. In summary method when the conditions hash is declared, in order was a mistaken search with the hosts names.
4. Commented some tests in reports_controller_test because I still can't make it up. I did this for a more confortable work with autotest.
5. Almost finished the user_test(just left to login test), I commited because the team needs my work...