First release using Github releases and semantic versioning

The PmagPy software package is a comprehensive set of tools for analyzing paleomagnetic data. It facilitates interpretation of demagnetization and Thellier-type experimental data and can create a wide variety of useful plots. It is designed to work with the MagIC database, allowing manipulation of downloaded data sets as well as preparation of new contributions for uploading to the MagIC database. It also supports the use of IPython/Jupyter notebooks for fully documented and nicely illustrated data analysis.