Ensure a new question set to grid_dropdown always has at least one column.
	modified:   app/controllers/questions_controller.rb
Prevent grid_dropdown column count from always reverting to 1 when set to something else.
	modified:   app/controllers/questions_controller.rb - set
	dropdown_column_count in render_grid_partial

	modified:   lib/surveyor_gui/models/question_methods.rb -
	set up an instance variable for dropdown_column_count
Update question_type_spec to account for change to pick inline questions.
	modified:   spec/models/surveyor_gui/question_type_spec.rb