Merge pull request #1 from dogonthehorizon/master

Converts method headers to Python docstring format in AffineCipher.
Added another example to the Exponential Cipher and added some clarification in a couple places.
Merge branch 'master' of https://github.com/MovieStiles/Cryptography
Accidently tried to display an image and only had the link.  Fixed.
Adding more to the general method of decryption of the Exponential Cipher.
Converting method headers in Monoalpahbetic files to Python docstring format.