Validate that the new password and the old password are not the same when changing the password in ACME

This change will not affect the API currently works.

It is just a change in ACME app to showcase the importace of password validation from the 3rd party application prior to calling the 1Password Extension.
Merge pull request #143 from AgileBits/validate-that-the-new-and-old-passwords-are-not-the-same-when-changing-the-password

Validate that the new password and the old password are not the same when changing the password in ACME