Fixed typo: AccociateTag -> AssociateTag

[angelxmoreno]

Was getting a "Missing Parameters" error saying "Your request is missing required parameters. Required parameters include AssociateTag". Noticed there was a typo that was fixed in the master branch but no in the 2.3 branch.

[angelxmoreno]

I noticed that making the change of spelling within AmazonAssociatesTestCase generates a different signature. This is because the signature is generated using the keys and values used in the query. Changing the spelling of a key would render a different signature.
So, that being said, I can either put the misspelled key back in the TestCase or I can replace the old signature with a new one. The problem with the latter is that I can not find a reliable way to generate the signature that is outside of the class itself. It feels a bit odd to use a method to generate a string and then test to see if it makes that string.

Any suggestions on how I should proceed?

[angelxmoreno]

great news! i found http://associates-amazon.s3.amazonaws.com/signed-requests/helper/index.html so basically i can put in the params the testCase is using and it will generate a realiable signature i can compare to. updating my code soon,