Refactor and consolidate parsing pathway

[blacktm]

Original implementation included completely separate pathways for parsing different document types (CCDA, C32). The new implementation should diverge at the point of parsing and data extraction, then join before constructing the final data object. This will reduce redundancy and make it generally easier to test and maintain.

[blacktm]

Modules responsible for processing each section of patient data now has a single method called process which is passed the source data in CCDA, VA C32, or JSON. The method then takes the pathway determined by the document type to extract data from the patient record, then joins back to assemble the resulting data structure.

Example taken from the Demographics module:

var process = function (source, type) {
  var data;

  switch (type) {
    case 'ccda':
      data = processCCDA(source);
      break;
    case 'va_c32':
      data = processVAC32(source);
      break;
    case 'json':
      return processJSON(source);
      break;
  }

  return {
    name: {
      prefix: data.prefix,
      given: data.given,
      family: data.family
    },
  ...