<ticket>#411</ticket> <bugfix>Added ability to create temporary directories in the FilePool</bugfix>
<ticket>#411</ticket>
<bugfix>Added ability to create temporary directories in the FilePool</bugfix>

vistrails/core/modules/module_utils.py:
- FilePool.create_directory: new method for creating temporary directories

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