Merge branch 'develop' of https://github.com/openpnp/openpnp into develop

# By Karl Lew
# Via Karl Lew (1) and vonnieda (1)
* 'develop' of https://github.com/openpnp/openpnp:
  Comments for IntelliJ IDEA
  Ignore IntelliJIDEA default project files created automatically on import