Fixes problem with missing firstname and lastname ..
Fixes problem with missing firstname and lastname ..

Related to #69

vhtien/gooddata-ruby,vhtien/gooddata-ruby,korczis/gooddata-ruby,fluke777/gooddata-ruby,fluke777/gooddata-ruby,vhtien/gooddata-ruby,korczis/gooddata-ruby,fluke777/gooddata-ruby,Seikitsu/gooddata-ruby,lubosvesely/gooddata-ruby,lubosvesely/gooddata-ruby,lubosvesely/gooddata-ruby,Seikitsu/gooddata-ruby,Seikitsu/gooddata-ruby