Removed code from ompl_app 

We are not near loading and saving paths. This code was copied from
ompl_app because I thought it would be useful. It can always be place
here again if we get around to that stage.
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
Plot now plots one of the multiple paths

There are no runtime errors, but only one of the paths is being plotted.

This closes #11. Because all that remains is GUI related to plotting.

But the priority of #27 is now high.

in MPLViewer.plot:
* label must be pased as **kwargs to axes.plot

in sdp_project_demo.plot:
* for path in paths
* paths list is in form [path, "plannerName"]

TODO: add a legend to the MPLViewer using the labels.
TODO: double check all Qt Signal and Socket connections
TODO: Investigate why multiple paths aren't being plotted.
Merge pull request #28 from mas-group/multi-planner-gui

Multi planner gui

only the multi plot isn't working