Changing verify_password so it works like verify_and_update_password. Currently verify_password was not only creating a hmac hash but also encrypting (encrypt_password is first hmac-signing and then encrypting).

Removed unneccessary and wrong tests.
Merge pull request #223 from ahtik/issue-verify_password

verify_password in 1.7.0 was no longer behaving like in 1.6.9