Revert "Added 4 bugs.\nConstructor (signature: RotCipher(int)) does not allow for setting of initial key value.\nDefault RotCipher value not 13.\nSetKey() change in key not properly reflected in encryption and decryption.\nGetKey() does not reflect current key (uses a fixed 13 regardless of case, by default)."

This reverts commit 0e9b939b56113195b1d02d33869b5f419dbf4908.