Misc package updates

[kbonney]

Overview

This PR addresses various meta-package issues brought up by reviewers

Addressed #68

• Renamed citation file and updated version number

Addressed #66

• Removed unused docker files

Addressed #59

• Removed extra requirements files
• Pinned documentation related requirements
• Updated RTD config to install doc requirements using the package installation extra

Addressed #56

• Added version to pvops

Addressed #63

• Removed external licenses

Addressed #65

• Renamed references to examples as tutorials for consistency.

Addressed #71

• Updated docs to refer to modules as modules, rather than packages.

Addressed #55

• Chose more appropriate author/copyright in setup.py and conf.py.

Also,

• Added copyright and license attributes to pvops
• removed manifest.in (not needed)
• removed docs/init.py (not a module)