minor changes
Merge branch 'tests' of http://github.com/adamnie/TC-SEFR into tests

Conflicts:
	img.py
naprawiam?
Optimized cropping for D_block and R_block, added img.cutsquare() as generalization of these two. This one allows to cut squares by pixel positions, might be useful.
Basic watermark thingy.
solved problem with permissions
nie pamietam
Added requested delta feature (without modulo). Tests are promising, however not sure if it works 100% properly. Lets hope it does.
doing my best
Added quadrant division and beginning of mapping. Works, bitch.
Wstepna implementacja kodowania fraktalnego w odniesieniu do generowania watermarku. Koniec pracy na dzis.
Add DCT to fractal compression, new class 'fractal'
Minor changes in fractal class
Rename metrics.py to fractal.py
Obliczanie informacji do zakodowania chyba zrobione.
Add embeding and retrieving watermark data from image
Checksum embedded after watermark
Adds quantization table and helper function
Probuje zaprowadzic porzadek.
Authentication works (tests required)