tweak .travis.yml to only check new files
delete trailing whitespace
prevent dead-code warning on main fn
Merge pull request #60 from jschaf/dcode

prevent dead-code warning on main fn
Merge pull request #59 from jschaf/delete-trailing-whitespace

delete trailing whitespace
Added tests to prime decomposition
add attributes to fix unused_imports
Added tests for letter frequency
Solve merge conflicts
Merge branch 'jschaf-unused'
Merge pull request #57 from jschaf/travis-tweaks

tweak .travis.yml to only check new files