fixed Multiprocessing view length. added new method to retrieve medium from model
Merge remote-tracking branch 'origin/devel' into heuristic_methods
bug fix and improvements on islands model. support for multiobjective
bugfix migration queue
bugfix on progress update to queue
fixing bugs
Install zmq with apt-get and install bokeh, pandas, and pyzmq from wheelhouse
Merge branch 'devel' of github.com:biosustain/cameo into devel

Conflicts:
	.travis.yml
Better output for media. Visualizing knockouts high-level API
setting seed on optimization and keep it in the results
Merge branch 'devel' into heuristic_methods
Skipping tests that stall on travis
Skipping tests that stall on travis
test with seeded data
Merge branch 'devel' into heuristic_methods

Conflicts:
	tests/test_strain_design_heuristics.py
setting travis to run multiprocess
Added seeded results for testing.
run heuristic tests on sequential view
Merge pull request #3 from biosustain/heuristic_methods

Heuristic methods use seed instead of pre-given random.
Unskipping previously stalling tests