Update version to 2.0.0 in docs.
Add autodoc for RiakContent class.
Fix some typos in RiakBucket docs.
Rewrite client docs page, breaking into sections.

* Changes default autodoc options.
* Improve documentation of some methods, adjusting the signature as
  necessary.
* Ensure the retryable decorator maintains the docstring.
Remove the tutorial.
Document more deprecated methods on client.
Update bucket docs.
Use the bootstrap theme.

This requires installing `sphinx-bootstrap-theme` from PyPi.
Move contents into a floating well, rename/remove some files.
Tweak some headers formatting.

Also, fix a bug where deprecated quorum accessor docs weren't being
formatted properly.
WIP Object docs, with explanations of siblings and resolvers.
Make some template tweaks.
Add "Advanced" page with all the miscellaneous and implementation details.
Add query page.

* Remove mapreduce page, merge and expand into query page.
* Move `RiakLink` to advanced page.
* Fix some docstrings in mapreduce and index_page.
Tweak layout to put pagers at top and bottom.
Fix some PEP8 and pyflakes things.
Document some of the mapred shortcut methods.
Fixup the pager on the index page and point at the tutorial docs.
A lot of final cleanups, deprecation normalized, etc.
Fix those long-standing PEP8 bugs in pool-grinder.