remove scisphinx dependencies
breathe 3.0 fixes
Expand tags.
list comprehension.
no more breathe/scispinx
make C++ API a bullet
merge upstream develop
add cppapi rst back
fix notebook css
Merge pull request #570 from crbates/no_scisphinx

No scisphinx or breathe
Merge pull request #568 from elliottbiondo/explode

Expand tags
Added random number seed to source sampling tests.
Merge pull request #579 from elliottbiondo/random

Added random number seed to source sampling tests.
Merge branch 'develop' into vnv