code: private int compareToReleaseMinor(GitVersion that) {
          if (this.containsReleaseMinor() && that.containsReleaseMinor())
              return compareToInt(this.getReleaseMinor(), that.getReleaseMinor());
          else if (!this.containsReleaseMinor() && !that.containsReleaseMinor())
              return SAME;
          else if (this.containsReleaseMinor() && !that.containsReleaseMinor())
              return LATER;
          else
              return PREVIOUS;
      }
docs: Compares minor releases values given that git version contains no tag
  for none of GitVersion objects
  
  @param that
  @return  SAME if both are equal, LATER if that is previous to this or PREVIOUS otherwise