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This PR contains a bunch of small changes that fix problems with getting documentation to compile correctly on Read the Docs:

• Updated conf.py (by regenerating with sphinx-autostart and copying over information.
• Fixed a bunch of warnings in docstrings, usually related to escaping asterisks (*)
• Changed a few other things for consistency (quote marks, indentation, blank lines, etc)
• Changed "0 dB" to "1" in margins.py, to avoid EE-centric terminology
• Updated the readthedocs requirements list
• Got rid of the use of mock (didn't seem to need it once numpy, scipy, matplotlib were imported in doc-requirements)
• Updated chapter, section headings in .rst files to be more consistent

update readthedoc requirements to use generic sphinx

103e241

try getting rid of versions for readthedoc dependencies

d9f6685

mark numpy.polynomial.polynomial as mock module in documentation

3dfc49e

DOC: updates to fix sphinx errors

93c9b52

DOC: add matplotlib to readthedocs requirements

d8e5684

Coverage remained the same at 78.962% when pulling d8e5684 on murrayrm:fix_readthedocs into 26661f6 on python-control:master.

Readthedocs build is failing on 0.8.0 #215