Dean Moldovan a3f4a02cf8 Minor docs build maintenance (#692)
* Switch breathe to stable releases. It was previously pulling directly
  from master because a required bugfix was not in a stable release yet.

* Force update sphinx and RTD theme. When using conda, readthedocs pins
  sphinx==1.3.5 and sphinx_rtd_theme==0.1.7, which is a bit older than
  the ones used in the RTD regular (non-conda) build. The newer theme
  has nicer sidebar navigation (4-level depth vs. only 2-level on the
  older version). Note that the python==3.5 requirement must stay
  because RTD still installs the older sphinx at one point which isn't
  available with Python 3.6.

[skip ci]
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