tutorials
https://github.com/HadrienG/tutorials
https://github.com/galaxyproject/training-material/blob/master/Metagenomics/tutorials/mothur-miseq-sop.md
http://microbialinformatics.github.io/
https://github.com/CGATOxford/proj029
https://bioinformatics.ca/workshops/2016/pathway-and-network-analysis-omics-data-2016
http://www.mpipz.mpg.de/R_scripts