Fixed a bug which was caused by the map_screen method in log_mapper which expects an array argument while lineplot.hittest method was calling it using a scalar argument.
Fixed a bug which was caused by the map_screen method in log_mapper which expects an array argument while lineplot.hittest method was calling it using a scalar argument.

burnpanck/chaco,ContinuumIO/chaco,ContinuumIO/chaco,tommy-u/chaco,tommy-u/chaco,burnpanck/chaco,tommy-u/chaco,ContinuumIO/chaco,ContinuumIO/chaco,burnpanck/chaco