- Catch AttributeError in `__del__` if process was not initialized and self.proc was not created
- Skip test_jsnode if node is not installed
- Removed package-lock from gitignore
MkDocs: sphinx docstrings rewritten to google, improved config, written the major part of how-to.
Readme: centered title + logo, added badges, features list, updated changelog.
Improved Files API, added automatical session saving and restoring to Client.
Some changes in makefile and gitignore.
License Notice now refers to all contributors.
