Lib submodules

Moved ompl_demo and ompl_gui packages into git submodules.
This allows for them to be easily included into a ros package as standalone libraries.
- www.github.com/moriarty/libsdp_ompl_gui
- www.github.com/moriarty/libsdp_ompl_demo

The submodules contain all original git information. They were created using:

  845  git clone git@github.com:mas-group/sdp_ws2013_ompl.git libsdp_ompl_gui
  848  git filter-branch --subdirectory-filter ./project/ompl_gui --prune-empty -- --all
  852  git remote delete origin
  853  git remote remove origin
  854  git remote add origin git@github.com:moriarty/libsdp_ompl_gui.git
  856  git push -u origin master
  
  858  git clone git@github.com:mas-group/sdp_ws2013_ompl.git libsdp_ompl_demo
  861  git filter-branch --subdirectory-filter ./project/ompl_demo --prune-empty -- --all