Add decyption functions.  Not working now.

I am currently trying to get the decryption functions to work.  Unfortuantely,
    they are not working together.  Even after running a simple encrypted
    string through the decrypter 10 million times, the output string looks
    nothing like the string I am expecting.

If I cannot fix this problem, I will revert my array to 26 characters, making
    it so that only letters (and probably spaces) can be entered.