jackson infrastructure
adjusted providers
adjusted measurements coder
adjusted validation filters
adjusted root resource
adjusted group coder
mail address
Merge branch 'dev' into jackson

* dev:
  added name/modified to track list (fixes #26)
adjusted tracks coder
adjusted groups coder
adjusted phenomenons coder
adjusted sensors coder
adjusted users coder
adjusted phenomenon coder
adjusted sensor coder
adjusted user coder
adjusted track coder
adjusted GeoJSON coder
license header
adjusted provider module