Passing variable Planners now works

Plotting not working. 

In console, solutions are found and each path from selected planner is
added to list of paths.

For proof of concept in KinematicCarMultiPlanner.py I used 
matplotlib.pyplot, which is the matlab wrapper for matplotlib. 
But in GUI I used FigureCanvasQTAgg from 
matplotlib.backends.backend_qt4agg must make some modifcations to
plot functions to plot multiple paths. 

When working on the plotting I will also look into #27