* notebook refactor and tests
* update PR
* add jupyter test jmd
* add back full warnings and remove debugging output
* Update test filename [ci skip]
* Conda for CI
* update for CI?
* remove Conda, IJulia, and tests for now
* Project.toml changes suggested by tinagly
* revive travis tests
* comment out nb tests
* Changed read/write cache to use serialize/deserialize instead of
JLD2. JLD2 fails to save strings longer than 2^16 characters, which
can occur in the stringmime() of large figures.
* Added test for cache with figures and html output.
Updated REQUIRE & Project.toml to include Serialization instead of
FileIO and JLD2
* Added "Import Pkg;" to expected output of errors, so that tests pass.