Human v1.3.2

[haowang-bioinfo]

Main improvements in this PR:

• Fixes (PR fix: remove dash from model ID while exporting to SMBL format #167):
  • remove dash from model ID Human-GEM when exporting to SMBL format
• Doc (PR update README with references/links to the Human-GEM user guide #165):
  • update README file with links to new User guide and relevant websites
• Features (PR feat: add gene associations to four mitochondrial transport reactions #163):
  • add gene associations and references to four mitochondrial transport reactions, as proposed in Additional gene associations for mitochondrial transport reactions #119
• Fixes (PR Fix: standardize EC codes and remove orphan metabolites #162):
  • standardize EC numbers by reformating ids and correcting invalid characters, as proposed in fix: standardize EC numbers in human-GEM #93, Update EC number field #127 and ec-code URI annotations often contain invalid characters #164
    • modify eccodes field by removing invalid characters, and moving spontaneous and TCDB ids to new fields in annotation file humanGEMRxnAssoc.JSON
    • remove unused metabolites m10018m, m10018p and m10010n from the model and annotation file humanGEMMetAssoc.JSON
    • adjust function annotateModel to adapt to newly added fields
    • rename subfolder ModeFiles to modelFiles

[JonathanRob]

Looks good. One note: I attempted to rename the ModelFiles directory to modelFiles, though this can be difficult because git generally doesn't recognize case changes like this (requiring two commits with an intermediate "dummy" directory name). If the change doesn't update properly on master, we may need to try doing this directly on that branch. This is, of course, extremely minor.