added imports inside of ompl_demo __init__.py

from Kine... import KinematicCarPlanningDemo2D

This avoids from ompl_demo.KinematicCarPlanning import KinematicCarPlanningDemo2D
or 
car = KinematicCarPlanning.KinematicCarPlanningDemo2D()

now
car = ompl_demo.KinematicCarPlanningDemo2D()
Added imports to ompl_gui __init__.py

Import all classes from there files. 
Now instead of 
ompl_gui.BoundsBox.BoundsBox()
just
ompl_gui.BoundsBox()
Changed import style

modified ompl_gui and ompl_demo __init__.py files to allow for cleaner
importing in commits
68d39d7f1cb40333b64603b727a7d2288d35837c (ompl_gui)
8e3b2d3dcd40bb3292c29cbcd3debc93649e4c40 (ompl_demo)

updated sdp_project_demo to take advantage of new import style
removed unused random and os imports