code: public String getString(String name) {
          return decryptValue((String)get(name, PropType.string));
      }
docs: Examples:
  
  (in mdw.yaml):
  <pre>
  # structured
  database:
  driver: org.mariadb.jdbc.Driver
  # flat
  hub.url: http://localhost:8080/mdw
  # mixed
  git:
  remote.url: https://github.com/CenturyLinkCloud/mdw.git
  </pre>
  
  <code>
  getString("mdw.database.driver")
  getString("mdw.hub.url")
  getString("mdw.git.remote.url")
  </code>
  
  @param name
  @return