Improve testing coverage #41
Description
As @tkunic mentioned in #30, it would be nice to eventually cover all of smiler_tools and smiler_matlab_tools with tests. Currently, the testing suite only covers the python implementation of pre and post processing. Including more tests would give the team greater assurance that new changes to the SMILER codebase aren't causing problems with other elements of SMILER. These tests should also be added to Github continuous integration, so they can be automatically run upon creating pull requests.