Adding 'metadata_name' trait to LassoSelection
Fix LassoSelection.selecting_mouse_leave()

It currently just prints out the event, and it does not do what the docstring says it does.
Merge pull request #96 from pzwang/master

add 'metadata_name' trait to LassoSelection
gc.set_fill_color does not accept numpy arrays
Merge pull request #100 from enthought/fix-horizon-color-bug

gc.set_fill_color does not accept numpy arrays