Download genes and pathways from KEGG

• Download all genes in all pathways from KEGG: getGenesInAllPathways.pl

• Organism list can be seen at: http://www.genome.jp/kegg/rest/keggapi.html

• Check this for KEGG API: http://www.genome.jp/kegg/rest/keggapi.html

• Example files for Mouse, Zebrafish and Human are in mouse_mmu, zebrafish_dre and human_hsa

• Output files:
  KEGG_Pathway-genes_Processed_<organism>.txt: All genes and pathways
  <organism>_all-genes.txt: List of all genes for an organism
  <organism>_all-pathways: List of all pathways for an organism in KEGG
  <organism>_kegg-info.txt: Information of the KEGG version stats etc for records
  <organism>_pathway-to-gene-mapping.txt: Pathway and gene mappping

• 20170316: Updated to adjust the gene name parsing a bit since in the new version file format has changed.
  Also created new directories for the version Mar_2016 and Mar_2017

• 20170405: There was a bug is gene name so updated again, now the gene names are proper.