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
Updated Gurobi file for running from prompt
Removed duplicate constraints, fixed combo bug

- Fixed regex which treated each digit as a separate entry in the set.
- Removed duplicate ‘triangle’ constraints
Adjusted bigM value, auto-set tolerance, seed

- Added random seed from arguments
Added timestamp to filename
Added gurobi related ignores
Corrected timestamp, arguments, save check
Added test file for optimal_trajectories
Moved optimal_trajectories to sample folder
Refactored and made tests for morris_optimal
Updated .gitignore

Added windows specific build directory
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