Add the 150 frames for the leadin only to the CDDB calculation.
Add methods to calculate AccurateRip id's and URL.
* morituri/test/test_image_image.py:
Add tests for it.
* examples/ARcue.py:
Show AccurateRip URL.
* morituri/image/image.py:
* morituri/test/test_image_image.py:
Add a task to verify a disk image, which also calculates
track lengths for tracks the cue file doesn't know the length of.