Fixed steganography fusion

The message being generate to be hidden was not long enough.
Created steganography_image_egypt.m
New test image: peppers
Will implement Egypt method in greyscale first
Described Egypt encoding process
RMSE function
Started implementing Egypt algorithm

What there is of it so far works, but is super duper slow. I probably
need to rewrite the code to avoid using the 4 nested for loops.
Added tiny test images
Egypt K1 done
Egypt encoding done
Use unique blocks for K2
Error blocks are calculated correctly now
Egypt first complete implementation

It actually sort of works! I am surprised.
Added option for key uniqueness
Block size is adjustable

Also included a list of all working wavelet filters so far in the
comments.
Tidied up Egypt algorithm
Added new wavelet modes and test
Attributed proper credit to some code
dwt2_pascal & idwt2_pascal
Merge pull request #3 from marbsydo/develop

Develop