Small refactor to sort islice() bug

- Added test for find_maximum
- Added checks for int in nth()
- Added check for number of combos exceeding max integer size
Added test to catch too many combos
Corrected check for combination > max integer
Merge pull request #20 from willu47/master

Solves #18
Updated setup to run nosetests from setup
Added exclusion for tests to find_packages
Updated Travis CI file to test with setuptools
Updated test to include fixture for readfile
Update Travis CI
Reverted to @jdherman version of .travis
Added script: command to run tests
Updated .gitignore
Added coveralls to Travis CI
Updated .gitignore
Update .travis.yml
Update .travis.yml
Update README.md
Added coveralls to .gitignore
Update .travis with Anaconda test environment
Update .travis.yml