upgrade cobra.external.six to 1.7.3
Update version.py

Update to aebrahim/python-git-version@e4b1833
cplex bug when setting paramter in solve_problem
cobra.io.mat dict construction is its own function

The create_mat_dict function may be useful when using sosmethig other
than scipy to write the mat file. The dict created contains vectors
matching the structure of the MATLAB COBRA toolbox struct.
README.md points to github site

Replaces the link to the older sourceforge site.
load_matlab_model reads subsystem
Improve setup.py on MacOS X

Running bdist_wheel will now append additional tag versions
automatically. Additionally, warnings for unused functions in clang are
now silenced to highlight other wanings which may signal issues.
update VERSION file on sdist/bdist_wheel
DictList Exception incorrectly formatted

The exception printed out the repr of the id function instead of the id
of the object which could not be added.
all of cobra core passes pep8

This is mostly whitespace and other small chagnes, such as rearranging
unnecessary list comprehensions to loops.