fix bug application startup bug
fix bug application startup bug

if there is a folder named 'director' in the current working director
then drake-visualizer failed to start.  explicitly importing director
first fixes the issue.

patmarion/director,manuelli/director,patmarion/director,patmarion/director,manuelli/director,patmarion/director,manuelli/director,manuelli/director,patmarion/director,manuelli/director