Add support for partial YES values

[DinisCruz]

for example data can be stored as a percentage on the YES value

{
  "metadata": {
    "team": "Team A"
  },
  "activities": {
    "Governance": {
      "SM.1.1": "Yes:100",
      "SM.1.4": "Yes:30",
      "SM.2.2": "No",
      "SM.2.3": "Yes:60",
      "CP.1.1": "Maybe",

or as an object (which will allow the storage of proof, i.e. definition of yes)

{
  "metadata": {
    "team": "Team A"
  },
  "activities": {
    "Governance": {
      "SM.1.1": { "value", "Yes" , "percentage": "50", "proof" : [ "link to issue or wiki] }
      "SM.1.4": "Yes:30",
      "SM.2.2": "No",
      "SM.2.3": "Yes:60",
      "CP.1.1": "Maybe",

[DinisCruz]

Now that #154 is implemented the way to do this is to just add the 'percentage' value to the activity object