Migrate documentation from wiki to readthedocs

The documentation on the wiki has been moved into the codebase
and converted from markdown to reStructuredText. No additional
changes to the content of the documentation has been made.
Set project name to "PRAW"
Increment copyright year.
Use full version for version.

If we are adding features in minor versions of PRAW
and continue the current rapid release schedule, then
the full version should always be shown to ensure users
are on the correct version of the documentation.
Pylint fixes in conf.py