gui/application.py: Fixed typo mkdir.mkdir -> mkdir
gui/application.py: Fixed typo mkdir.mkdir -> mkdir

VisTrails/VisTrails,hjanime/VisTrails,VisTrails/VisTrails,Nikea/VisTrails,hjanime/VisTrails,celiafish/VisTrails,minesense/VisTrails,celiafish/VisTrails,minesense/VisTrails,Nikea/VisTrails,VisTrails/VisTrails,Nikea/VisTrails,hjanime/VisTrails,celiafish/VisTrails,hjanime/VisTrails,Nikea/VisTrails,celiafish/VisTrails,minesense/VisTrails,VisTrails/VisTrails,minesense/VisTrails,hjanime/VisTrails,minesense/VisTrails,VisTrails/VisTrails