added bounding_box to class Straat refs #26
added tests for property bounding_box of class Straat refs #26
Update version info.
Merge branch '26_bounding_box_for_straat' into 0.4.0
Merge branch 'master' into 0.4.0
Set version to 0.4.0
Merge branch '0.4.0' into 27_bounding_box_for_huisnummer