Add docs for types

Add a page to pull in the docstrings for the option types,
and make the docstring changes in the module necessary for
that to work properly.

Also fix a formatting issue in the docs for the cfg module.

Change-Id: Ib1cf24e59ecc3592d3b703f99659f4a0fdbc7f5c
Add Style Guide for help of config options

This is an initial document on how the config options should be written
and formatted.

Change-Id: Ic838a322ec4c1fc7b2507ecb126ef372617d0fc5
Support building wheels (PEP-427)

Universal is used to identify pure-Python module(by bdist_wheel). For
these, it is sufficient to build a wheel with _any_ Python ABI version
and publish that to PyPI (by whatever means).

Change-Id: Ieabefc1fc8c8fbcd8749c07ccabb1ff88e1a761e
Fix misspellings in oslo.config

Fix misspellings detected by:
* pip install misspellings
* git ls-files | grep -v locale | misspellings -f -

Change-Id: I96a3e5717cbce66c19ead15a9e491fe4a44f6e88
Closes-Bug: #1257295
Merge "Add docs for types"
Merge "Fix misspellings in oslo.config"
Merge "Support building wheels (PEP-427)"