ElementPosition.diff() (only compares against numbers so far)
ElementPosition.diff() can compare against ElementPosition
Roadmap update
INTEGRATE: ElementPosition

* dev:
  Roadmap update
  ElementPosition.diff() can compare against ElementPosition
  ElementPosition.diff() (only compares against numbers so far)
  ElementPosition.match()
  ElementPosition.value()
  Position.plus()
  ElementPosition.toString()
  ElementPosition.description()
  Initial idea of ElementPosition