adding a test, checking if the is_binary function returns True when a binary file is passed.
add more docstrings on the tests
Travis should run the tests.
Changing the is_binary function for the binaryornot.is_binary that can get to more binary cases.
Adding binaryornot as a dependency, so there is a requirements.txt now, and add it to setup.py.
Also travis install it before running the tests
Merge pull request #19 from arruda/adding-tests

Adding tests