feat/anaerobicgrowth&Nitrogen-limited growth

[feiranl]

Main improvements in this PR:

• To update the function anaerobicModel.m to fix the issue mentioned here #198. heme was removed as in earlier function. This time, we update the function by removing heme, NAD, NADP, NADPH and NADH when we simulate anaerobic condition.
• To update the Nitrogen-limited condition growth by rescale the protein content
• To update a growth test for model validation, which is also the figure S4c for the yeast8 paper.

I hereby confirm that I have:

• [X] Tested my code with all requirements for running the model
• [X] Selected devel as a target branch (top left drop-down menu)
• [X] If needed, asked first in the Gitter chat room about this PR

[feiranl]

It looks good from my side. I run the code on MAC, it generate the figure perfectly.