Adding constant for single element arrays
Merge branch 'single_elem_arrays' of https://github.com/hiwrac/halbuilder-api into feature/single-elem-arrays

* 'single_elem_arrays' of https://github.com/hiwrac/halbuilder-api:
  Adding constant for single element arrays
Updated version for implementer compatability.
Merge branch 'feature/single-elem-arrays' into develop

* feature/single-elem-arrays:
  Updated version for implementer compatability.
  Adding constant for single element arrays