Some documentation updates.
Add ability to sample random distributions nonuniformly.
Add unit tests.
Try to get coveralls working. Need to move back into git repo.
Try copying .coverage file to git repo.
Try to print coverage report after copying .coverage back to repo.
Print out coverage report before copying .coverage.
Forcibly make coverage only cover 'dit'.
Update README.md

Add coverage icon.
Merge branch 'master' of github.com:dit/dit