Update docs and log stdout dnadiff_dist_matrix
Add docs requirements file
Mock out modules for readthedocs
Add dna_diff_dist_matrix static files
Change order in docs requirements
Mock out concoct.utils in docs
Mock out concoct in the docs
Mock out vbgmm
Mock concoct.utils as well as concoct
Test rebuild readthedocs
Fix import errors for docs
Fix format error when program does not exist
Remove sphinx from setup.py

The requirements for generating the docs are now in doc/requirements.txt so it
is not necessary to have them in setup.py
Update conda on Travis

Uses latest Miniconda version for python2 and 3.7.3 for python3. Miniconda3
does not have a latest link (yet).
Fix miniconda path on Travis
Merge pull request #126 from inodb/doc_dist_matrix_script

Doc dist matrix script