Human 1.3.1

• Fixes (PR #160):
  • modify increaseHumanGemVersion function to adapt with the Yaml-based workflow and enable xlsx format output
• Style (PR #159):
  • reorganize repository directory structure according to standard-GEM template
    • remove deprecated functions docRxnChanges and writeRxnChanges
    • rename folders complementaryData and complementaryScripts to data and code, respectively
    • restructure code subfolder and include a dedicated README
• Fixes (PR #158):
  • adjust getINITModel2 to avoid removing metabolic task-associated metabolites
• Features (PR #156):
  • activate Yaml-based workflow
    • remove MATLAB model file from current and later all other branches except master
    • minor fixes to importHumanYaml and testConversionYaml