0.1.4 Release

• This release adds Python 3 compatibility, while still maintaining Python 2 compatibility.
• The tests have been improved: they no longer depend on the hepdata_converter module and now run outside the hepdata-converter-ws Docker container, testing the web service connection.
• A timeout parameter (with default of 600s) can be passed as an argument of the convert function.
• Error handling has been added to the request to /convert.
• Dependencies have been moved from requirements.txt to setup.py.
• Documentation has been improved in the README.md file, in the docstring of the convert function, and in the metadata pushed to PyPI for tagged releases.