Local wave activity package updated to version 0.3.7

The python package hn2016_falwa has just been updated with the following changes:

• Switched the unittest framework from unittest to pytest
• Improved interface of the QGField object
• Added a new function hn2016_falwa.download_data.retrieve_erai to download ERA-Interim data (but not connected to the main program yet)

My package uses f2py. When switching from unittest to pytest, there are several changes to make in setup.py and .travis to accommodate such usage:

In setup (numpy.distutils.core.setup), remove the argument

test_suite='tests.my_module_suite'

and add:

    packages=find_packages(),
    setup_requires=['pytest-runner'],
    tests_require=['pytest'],

In .travis, the script section looks like:

script:
  - python setup.py pytest