Specify markdown in setup.py

Merge pull request MassimoCimmino#71 from MassimoCimmino/issue70_v112

Issue70 v112

Update CHANGELOG.md

Increment to version 1.1.0

Increment to version 1.0.0

Changelog for v0.3.0

Update doc for ReadTheDocs

Refactor g-functions (Issue MassimoCimmino#9)

Initial contributing guidelines