Replace epydoc with pydoctor

[tristanlatr]

Hi,

I'm working on improving pydoctor this days and I realized that your API documentation is still using the 10 years old Epydoc software.

I've forked this repo and quickly generated API docs here: https://tristanlatr.github.io/google-api-python-client/index.html

Know that the google docstring format parsing is still unreleased, see this PR, but is should be packaged with pydoctor soon.

I volunteer to help you with this move.

Tell me what you think.

Is your feature request related to a problem? Please describe. Generate the API documentation with Epydoc will be a problem the day you can't generate your docs with Python2.7 anymore since Epydoc do not support Python3.

[Evolancer02]

I'm working on this.