Merge tag '2.1.1' into develop

Rel

* tag '2.1.1':
  [maven-release-plugin] prepare for next development iteration
  [maven-release-plugin] prepare release halbuilder-api-2.1.1
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
Updated deps to support newer git
[maven-release-plugin] prepare release halbuilder-api-2.2.1
[maven-release-plugin] prepare for next development iteration
Merge branch 'release/2.2.1'

* release/2.2.1:
  [maven-release-plugin] prepare for next development iteration
  [maven-release-plugin] prepare release halbuilder-api-2.2.1
  Updated deps to support newer git
  Updated version for implementer compatability.
  Adding constant for single element arrays